Abandoned Engineering

Hear how a crumbling hill in the Peak District and dunes in California caused the closure of two roads. Learn why a route used by the French Resistance shut in 2003.

How Europe's most advanced power station became a film set. Plus, the structures made by scientific pioneer Nikola Tesla in his thwarted quest to prove the US with free electricity.

Exploring ship graveyards, including Scapa Flow in Orkney, where German warships were scuttled after the First World War, and Mallows Bay, home to 200 wrecks colonised by wildlife.

Soaring across some of the widest rivers and deepest valleys on the planet, bridges have always been at the cutting edge of engineering. We travel high into the mountains of the Colorado desert to find out why a hidden engineering masterpiece could disappear at any time. We ask why a stretch of overgrown concrete in a Czech reservoir is known as 'Hitler's bridge'. We find out how the highest bridge in the world collapsed in less than one minute. Finally, we uncover the story behind Cape Town's invisible bridge, which never carried a single vehicle.

We aim for the stars and find out why unwanted battleship guns allow the United States to gain vital information about the borders of space. We ask how the shattered remains of a secret Nazi base became the first on the path to a new world, with the development of the ground-breaking V2 rocket. We explore a forgotten structure deep in the Arizona desert to ask if it is the true home of America's space programme. And we reveal the bizarre link between a discarded oil drum and a Cold War struggle to survive in zero gravity.

Empty buildings and infrastructures are full of the echoes of real people and vanished lives, leaving many questions unanswered and mysteries unsolved. We explore the worlds strangest engineering projects that created empty silent cities. We ask why a ruined cold war air base has become a no-go area and how a tiny Japanese mining island become the most over-crowded place on the planet. We find out if the street layout of the Soviet Union's model city become a matter of life or death for its population. And how did Nazi Germany create a huge mind control facility at a holiday resort?

A lost highway in the Brazilian jungle, a forgotten bunker system in the French Alps and a man-made island in the shadow of the Statue of Liberty. Who built them, and why?

The Georg Thiele was a technological masterpiece, but it is a shipwreck, lost to the sea in a Norwegian Fjord after running aground during a naval battle in WWII. Also in this episode, a mysterious concrete giant which echoes the Communist era atop a mountain peak in Bulgaria, a fantastical structure built in the middle of an American river, and one of the world's first and finest Artic feats of engineering, The Miles Glacier Bridge in Alaska, which, when it was first built in the early 1900s, was known as the Million Dollar Bridge.

This week, find out why Fordlandia Rubber Town, a symbol of the American dream first established by Henry Ford in the 1920s, is now left rotting in the Amazonian rainforest. Also, what secrets do the enormous monoliths scattered across a secret forest complex in Eastern Poland hold? And what secrets does a fortified corridor of death with a Cold war past stretching for miles across Hötensleben, Germany hold? And a bizarre structure in South Western France built to speed trade was once at the forefront of design, now lies disused and abandoned, but why?

The Canfranc Railway Station is an elaborate abandoned Nazi railway station built near a town of only 500 people in the Pyrenees in Spain. But why was it built there and what secrets does it hold? Also examined in this episode is the Salton Sea Navy Base in California - a military post in the middle of the desert in the American west, the Kola Superdeep borehole - a wrecked record-holding Arctic facility in Russia that goes deep, deep underground, and a huge tower looming over an industrial area in Belgium. All of these extraordinary places and objects were at the cutting edge of design and construction, but now they stand disused, sometimes contaminated and sometimes dangerous.

Learn about the strange-looking, derelict military facilities in Farnborough, which were once wind tunnels that played a vital role in WWII.

An abandoned concrete wall... five strange deserted structures. A lost escape route from nuclear Armageddon... A submerged link to D-day... Once they were at the cutting edge of design and construction, now they lie disused, contaminated and dangerous. But who built them? And why were they abandoned?

A strange group of rusting structures off the coast of England, a dilapidated mediaeval-style castle in the heart of urban America and one of the biggest machines ever built lying forgotten in a German field. Once these extraordinary places and objects were at the cutting edge of design and construction, but now they stand disused, sometimes contaminated and sometimes dangerous. But who was it that built these mysterious structures? What incredible stories surround them? What secrets do they hold? And why were they abandoned? Seven huge steel boxes rise 80-feet out of the water off the coast of England at the mouth of the River Thames. Now rusting and derelict, The Red Sands Sea Fort was originally built as a first line of defence to deter the Nazi threat to London. Successfully helping the Allies to victory in 1945, the project is one of the most extraordinary engineering successes of World War II. Also in this episode, a sinister-looking deserted Cold War concrete pyramid in North Dakota; a vast empty complex located in the heart of a Philadelphia; and a 4,000-tonne corroding mass of steel, left to rot in a field in Eastern Germany.

A dark past explains why the Pölitz Synthetic Fuel Plant in Northern Poland is now a derelict industrial site littered with tunnels, bunkers and huge crumbling concrete structures lost in dense forest. The site was built in 1937 as part of Nazi Germany's drive to become self-sufficient on fuel, but it was no ordinary refinery. It used the latest technology at the time, at great expense, to turn coal into oil. In 1945 an Allied air raid pulverised the plant, severely wounding the German war machine and leaving the site in ruins. Other structures examined in the first episode include the incredible vertical Phoenix Shot Tower in Baltimore, which was built to provide America's own ammunition, the former American spy instillation called Teufelsberg (or "Devil's Mountain") in Berlin which waged the Cold War against the Soviet Union, and the now derelict Rubjerg Knude Lighthouse which was built on Europe's second-fastest moving sand dune in Denmark.

An eerie, empty country village which hides a sad secret, a mysterious tower battered by the elements and a disused railway deep beneath the streets of a city.

A village ruin, pitted and scarred, a ghostly fleet of ships, a bridge to nowhere hidden in a forest and strange metal structures in a wood.

Hidden tunnels that saw a city prosper, a sunken wreck with a remarkable past, a concrete wartime dome and a mysterious Cold War building.

A devastated cliff-top ruin, an extraordinarily tall tower, a concrete structure stranded at sea and a heavy metal monster in a field all feature.

A towering structure with an explosive past, a deserted cityscape, a mysterious top-secret facility and a vast Nazi construction.

Concrete channels hidden in a mountaintop forest, a collapsing bridge, a marooned military base and the upright rusting carcass of ship.

An abandoned prison beneath the water, a tunnel in the heart of a mountain, concrete towers hidden in the woods and a rusting coastal relic.

The programme looks at a mysterious group of rusting ships stranded in an arid desert, a monstrous defensive line on the snow-covered peaks of the Italian Alps, a ghostly collection of buildings, and the sunken remains of a unique vessel.

A pioneering complex marked by both glory and tragedy that's soon to be lost forever, and towering remains from an industrial age.

A vast snowcovered monster in the icy wilderness of southern Alaska, a ruined super structure that overshadows everything around it in and a landscape of confusing and surprising structures that once represented a bold statement of Spain's plans for the future. Plus, a long, winding formation that was once supposed to help defend Hitler's Third Reich. And in Budapest, Hungary, the stripped skeleton of an industrial relic lies rusting away.

A sprawling Wild West ghost town sits peaceful and abandoned in Montana, USA, but is still haunted by tales of murder, corruption and buried treasure. Also, a cold, dark, underground mountain network that cost the lives of thousands... the crumbling ruins of an English industry that turned poison into profit... a peaceful village that was shattered by the terrors of war.

Still standing today, a fierce-looking prison and an innocuous looking office building in Berlin were actually the headquarters of a feared and ruthless organisation - the Stasi. Also, a covert Communist base hid Cold War submarines for Tito, the former leader of Yugoslavia on the island of Vis. A seemingly innocuous sports centre hides a sinister underground bunker. And the former HQ of the Soviet Army in East Germany was a forbidden Soviet city within a city.

A strange-looking deserted town with an almost supernatural atmosphere on a remote Norwegian archipelago in the Arctic Ocean was in fact an ambitious Soviet mining outpost with a tragic history. Also, a collection of imposing buildings on the southern tip of Australia, the remains of curious-looking basins emerging from the waves in the shadow of the Golden Gate Bridge and the ruins of a monumental construction project in southern Germany that was a ruthless regime's deadly prototype.

A formerly luxurious and strategic mountain-top villa on the island of Rhodes in the Mediterranean that's been ravaged by acts of revenge by locals since 1955.

Features a ruined compound in Colombia which was once home to Pablo Escobar and alien-looking structures with no apparent purpose, isolated in an empty English marshland in Denge, near Dungeness in Kent. But how and why were they ever built at all, and why are they now left abandoned?

A town in West Virginia that fell victim to the pace of change when steam trains became obsolete and an underground complex in Italy that had been abandoned for nearly 2,000 years.

Projects include a maze of tunnels filled with haunting remains beneath the streets of Paris and a strange formation of domed structures hovering over the waters off Florida.

A little-known dark past explains the vast monolithic structures that dominate the small British island of Guernsey.

A seemingly endless concrete line stretching through the French countryside, which sits as a monument to a discarded engineering advancement.

A settlement in Argentina destroyed by floods, a town in the US that has been erased, and a Soviet dream-town that turned into a nuclear nightmare.

An Albanian village home to Allied secret agents, devastated for resisting the Nazi war machine, and a notorious asylum in America that enforced lobotomies on a terrifying scale.

An American prison for the violent and deranged with links to an infamous cult leader, and a cavernous tunnel network in France offering shelter from unrelenting bombardment.

Including an exploration of forgotten relics from the defence of America's homeland, at Fort Jackson, USA, concealed by the banks of the Mississippi River; a concrete behemoth at Lorient Sub Base, on the coast of France, that proved invulnerable to enemy bombardment; and a ghostly ruin at Gwrych that is now home to a haunting presence.

Including an exploration of a marooned iron-clad structure in Portland, off the coast of England, that hides a dramatic story of war and resilience; Pratt Cotton Gin Mill, a vast facility in the heart of America's deep south that helped tear apart a nation; and a Mediterranean island fortress at Spinalonga, Greece, that became the scene of a dark conspiracy.

A secretive underground base that concealed the power to destroy nations, and a sprawling industrial relic clinging to the edge of an unforgiving waterfall.

Claustrophobic prison cells that contain a story worthy of international acclaim, and a vast mountainside complex that held the power to change the world.

The underground base with the power to destroy a nation, the site linked with an attempt to kill a dictator, and an ancient world discovered in the American wilderness.

The desert town that faced a disaster of biblical proportions. Plus, vast coastal ruins that reveal a past once wiped from history.

An impressive compound commandeered and repurposed by a brutal regime and an eerie complex off the coast of Ireland that became the biggest of its kind.

A creepy collection of buildings, monuments hidden in a Parisian park and an eerie graveyard of discarded ships strewn along the banks of a mighty river.

A small isolated country littered with strange concrete mushrooms and a secret Japanese facility that was once at the forefront of weapons technology.

The mysterious Cachtice Castle home to Elizabeth Bathory, said to have killed over 600 girls and a mysterious structure on the 38th parallel.

A juggernaut of Soviet engineering which was crucial to the international space race. Deserted Scottish coastal defences and a complex that's crucial to American history.

A now silent site that played a pivotal role defending the U.S through the 20th century. Plus, a crumbling Italian fortress and a ghostly Ukrainian mansion.

An extended special featuring a deserted Caribbean city, an American ghost town still burning and an Arctic settlement facing a terrifying future.

A complex of stone buildings near Hadrian's Wall that were built to keep Northern hoards at bay. Also, a top secret military facility in the American Midwest.

Within a dense Polish woodland sits a forgotten complex with an explosive history. Also, grand coastal defences in Ghana reveal a tortured past.

Examining a ghost island once belonging to a secretive country on the fringes of Europe. Also, a haunting site in the UK with evidence of strange burial practices.

What happened to an infamous pirate city in Jamaica? Also, a grim gulag in Croatia and a Louisiana plantation caught up in the aftermath of the American Civil War.

Bizarrely-shaped huts in India, once home to global superstars, are now eerily quiet and neglected, and a shattered compound in Colombia linked to a criminal mastermind.

A fairy-tale castle that staged one of the strangest stories of the Second World War and a haunting complex on an old American Frontier.

A volcanic island just off Taiwan containing chilling ruins from its darkest era, and a miniature railway that lies forgotten in the woods of Arkansas.

Eerie ruins hiding in the forested hills of Arkansas, USA, and a disintegrating gulag in Albania that housed enemies of the state.

A Middle Eastern region littered with ruins and a strange facility in Taiwan that struck fear into the hearts of those who knew its true purpose.

A real-life concrete jungle in America's 'Rust Belt', and an industrial facility that brought energy to a remote corner of the world.

An iron monster lost in the Alaskan tundra, a Crusader fort thrown into a modern conflict, and a prison built to house a mafia kingpin.

An American desert canyon where fortunes were made and lives were lost, and an island fortress in Scotland with an Achilles heel.

An engineering masterpiece carved into the cliff-face, and a long-range beacon that transmitted one of the most infamous messages in American history.

Ruins of a vast industrial ghost town in the United States, a windswept Scottish island and the remains of a resort in Japan that watched a city burn.

In North Wales a secret facility which once manufactured mustard gas and enriched uranium lies in ruins. In Malta is a luxurious quarantine facility, that hides a dark secret.

Legendary film sets with surprising pasts and real locations that inspired Hollywood. Within these decaying structures are the echoes of history.

This episode travels to Chile, the Maltese capital Valleta, Havana and Germany, to reveal: honeymoon home of a young princess that offered her a glimpse of freedom; grand monuments designed by the most notorious dictator of the twentieth century; a sprawling industrial complex?the site of a ruthless disappearance; and?the artistic dream of?a revolutionary now in?ruins.

Exploring a bloody battleground on the Pacific Island of Peleliu and an ominous military stronghold in Russia.

Exploring a dystopian powerhouse in Pennsylvania, USA, a fairy-tale castle in Poland and AngloSaxon religious ruins across vast plains of Scotland.

Exploring a luxury resort that conceals a top-secret facility, a mysterious complex in Bali struck by disaster, and a relic of hope near Jerusalem.

Featuring Italian ruins immortalised by Hollywood, a crumbling Chilean city with two lives and a brutalist Scottish relic whose prayers went unanswered.

Exploring a desert island with an infected past adrift from the US mainland, the brutalist palace of a mad Bulgarian dictator, and a doomed top-secret Nazi project.

An ominous tower in the forests of Croatia, a New York City complex that broke the mould, and a grand facility guarding the London riverbanks.

Exploring a bizarre block in Taiwan resembling a giant speaker, a pioneering venture in Alaska, and an alpine village that masks a military beast.

Exploring a beachside resort with ties to the Russian mafia, a windswept base hiding lifesaving technology, and a site in Iowa plagued by its past.

Exploring a jungle refuge concealing a story of royal deceit, nuclear bunkers infiltrated by outsiders, and a haunted hospital marked by scandal.

Exploring a ghost town in Colorado, the remnants of an industrial enterprise in Puerto Rico, and a remote village on Cyprus.

The home of an African dictator and a sporting hero, and the facility that held apartheid's greatest critic are abandoned, but still have unique stories to tell.

Exploring a royal retreat caught in a web of corruption, an engineering marvel hidden behind the Niagara Falls in Canada, and a subterranean treasure.

Exploring Hartwood, a haunting facility in Scotland, ruins of an ancient city in Iraq and a scandal hit town in New Mexico.

Exploring a complex in Georgia pointing into deep space that almost discovered a signal from aliens.

Exploring a picturesque French castle, the ruins of a Kansas City hospital, an ancient Turkish city, and an island in Ireland that brought its inhabitants closer to God.

Exploring a crumbling dam hidden in the Welsh valleys, a quaint outpost on a paradise island, and a mastery of ancient engineering that brought life to the planes of Mexico.

Exploring a luxury resort in Argentina, a Greek palace above a Mexican city and a former hotel in Hawaii.

Exploring a British fort that became a bizzare zoo, a brutalist school for Communist top brass and a lost world hides secrets of a vanished people.

Exploring a ruined castle above a German village, a rural town in Idaho, a futuristic skyscraper in Johannesburg and a fantasy world outside of Buenos Aires.

Exploring a military strong-hold in the Philippines, a facility that spawned an American sporting great, and an English relic that hosted a cinematic sensation.

The graffitied remains of a correctional facility in Atlanta, USA with a controversial and unexpected past, forgotten remnants of fraud and fusion on the Western border of Argentina and a mysterious ancient complex built by a devoted Khmer King in the jungles of Cambodia.

Exploring the remains of a pioneering industry town in Ohio, a once beautiful Croatian resort bombarded by enemy fire, and an otherworldly garden of Eden in Mexico.

Exploring a once lavish palace in Iraq, the Sathorn Unique, an epic ghost tower in Thailand, and a former sports stadium in Georgia, USA

Exploring the Dew Drop Inn in New Orleans that dared to take on the authorities and paid the price and Belgica Fort, built to defend an unlikely treasure.

Exploring a decrepit Liberian landmark with American origins, a desolate town in Belgium and a pioneering scientific structure in Cleveland.

Exploring a grand structure in Hull that was reduced to rubble by Hitler's planes, Casa Albero in Italy, USS Hornet in California and the Sofia tunnels.

Exploring Serbia, Fort Pike in Louisiana, and a mountainside refuge in Georgia that was revealed to the world by an act of God.

Explores a dense forest near the Czech capital of Prague that hides Houska Castle, an eerie keep that has been subject to long-standing rumours that it possesses supernatural powers.

Exploring traces of a mass deception hidden at Ponte Dirillo in Italy, as well as a once lavish theatre in Ohio and an ancient city with a poisonous secret.

Exploring an industrial ruin in the Florida Everglades that once competed in the greatest race humankind has ever witnessed.

Exploring Agdam, a city in Azerbaijan raised to the ground in a conflict decided by a new weapon of war.

Exploring the remains of an ingenious sky-high solution to a ground-based problem, Chiatura, once know as the Venice of the air

Exploring a series of vaults, hidden from view in Edinburgh, Scotland that tell a murky story of opportunity, crime and destitution.

The Tunnels of Gibraltar were a Second World War espionage base, hidden in the Rock of Gibraltar, which lay undiscovered for decades. At Atlas-1 Test Site, are the remains of an ingenious US Airforce project that continues to keep people safe.

Explore Oradour-sur-Glane, a French town drenched in infamy, the victim of a notorious raid, Alcatraz, a facility famed for breakouts, subjected to a daring break-in, and Sealand, a micronation off the English coast, stormed by a band of mercenaries.

Exploring Old Joliet Prison, a battered facility near Chicago that descended into open war, but then hosted the Blues Brothers!

Exploring Yongma Land - a South Korean dreamland given a second life from the most unlikely of places.

A symbol of national pride that became a symbol of excess in the Turkish capital of Ankara.

Exploring Old Byron Hot Springs in the Californian desert - a once glittering Hollywood hotspot, converted into a top-secret interrogation centre.

Exploring Dover Commando Fortress in South East England, where traces of a top-secret Commando raid are still visible.

Exploring a theme park in Buenos Aires built in a time of terror and dogged by controversy, and a jaw-dropping collection of castles in Turkey.

Exploring Haludovo Palace Hotel in Croatia, Wolf's Lair, a German military complex and Herouni Mirror Radio Telescope - a pioneering facility in Armenia.

Exploring Air Studios, on the Island of Montserrat, that became a mecca for rock legends. Also Tskaltubo, in Georgia, built to host a fearsome dictator.

Exploring Seodaemun Prison, a facility in Seoul that helped spawn a legend known as South Korea's Joan of Arc.

Exploring the ruined site of Troy, that helped decode one of the world's most enduring mysteries.

Exploring Anchieta, a tropical island complex in Brazil and the scene of a dramatic uprising.

Exploring a country estate in Ireland where family divisions reflected a national struggle and was caught in the crossfire.

Exploring the Apollo Movie Theatre in Tbilisi, Georgia, an ornate shrine to Soviet propaganda.

Exploring Camp Hero in Long Island, and a salt mine in Poland.

Exploring Castel Volturno in Campana in Italy, Colorado and HMP Shepton Mallet in Somerset.

Exploring Chateau Aubery on the island of Martinique, where a criminal kingpin wiped out the opposition.

We explore Fort Sherman, a jungle stronghold in Panama built to defend a prized American possession that soon faced the threat of an elaborate Nazi conspiracy.

We visit the Polish city of Walbrzych, where a fairytale castle on a cliff conceals a vast subterranean tunnel network linked to a legend of lost Nazi gold.

We visit the decaying remains of Old Essex County Jail in New Jersey, a facility that became a powder keg of injustice that was set to explode.

We explore Schindler's Ark in the Czech Republic, a secret refuge in Europe's killing fields, and a lost Amazonian paradise deep in the Brazilian rainforest.

We explore Fort Amador, the site of an American invasion in Panama, and a grisly Polish facility that once caged members of a revolutionary movement.

We head to the Tunisian desert to explore a vast chain of ruins that once stood in the way of Allied Victory - until a band of rogue heroes uncovered their weakness.

We explore Namibia's arid Skeleton Coast, where traces of a brutal but once vital industry lie scattered.

Exploring Opa-Locka City Hall, a strange structure that began as the dream of an American Renaissance man, but soon turned into a nightmare.

Exploring derelict villas in Sicily that reveal the island's complicated history with the Mafia and an aristocratic mansion in Ireland embroiled in a bizarre terrorist plot.

Exploring a nuclear-armed facility in Arkansas that served as America's last line of defence in the Cold War and an industrial relic in Wales that felt a young Winston Churchill's wrath.

Exploring a concentration camp in the Czech Republic used for a publicity stunt to fool the world and a stark facility that once housed Oscar Wilde.

Exploring a palatial ruin in Philadelphia built from the riches of an industrial golden age and a country palace in Poland, the scene of a honey-trap devised to ensnare Napoleon.

Exploring two ornate buildings in Texas that were once at the heart of the Mexican Revolution and a top-secret facility outside Berlin, used by a ruthless dictator to escape justice.

Exploring a crumbling hospital complex in Germany that became the site of unspeakable atrocities and a sprawling Texan farmstead with a hellish reputation.

Exploring a derelict stadium in Lithuania that hosted an unlikely Cold War matchup and an industrial relic in England.

Exploring an Oklahoman town so wealthy it inspired a Hollywood film.

Exploring a secret subterranean network in London that inspired James Bond author Ian Fleming, and an Italian country retreat that was designed to brainwash a generation of children.

Exploring a secret New Jersey facility infiltrated by a Soviet spy ring, an island stronghold besieged by the Nazis, and a palatial compound in Peru frequented by the country's elite.

Exploring a remote Peruvian island besieged by a violent rebellion, a refuge in Nevada that offered hope to its occupants, and a French worker's paradise seized by an invading force.

Exploring a Philadelphia venue that set the stage for era-defining artists, a French compound where a staggering deception was launched, and a the scene of a baffling crime in Malaysia.

Exploring a top-secret facility in Scotland besieged by militant protesters, and a small Greek island caught in a chilling web of controversy.

Exploring the nerve centre of a heroic rescue mission in England, a dilapidated mansion in Virginia raided during the Civil War, and a facility in Detroit where a champion made his name.

Exploring a top-secret military base in Michigan linked to an unexplained disappearance, and a California transportation hub that inspired lasting change.

Exploring a towering structure in London on the banks of the river Thames, witness to the city's darkest days, and a Wisconsin farmstead that brewed up a storm.

Exploring a Dover stronghold transformed during an unprecedented crisis, and a top-secret site in Japan used for wartime missions of no return.

Exploring Nazi towers in Berlin that were defended to the bitter end by child soldiers, a Chicago institution that was the largest of its kind, and an odd vision in the Malaysian jungle.

Exploring a serene institution in Wisconsin seized out of righteous anger, a Spanish settlement stained in innocent blood, and a subterranean lair in France with a disturbing objective.

Exploring a complex in New Jersey infiltrated by a notorious gang, a tranquil Japanese island with a poisonous legacy, and a top-secret bunker in Lithuania raided in the name of freedom.