Mysteries of the Abandoned: Hidden America Season 4 Episode release dates & where to watch

1. The Cult Hotel

Get chills in a bleak communications hub that housed a California cult and then eye a secret US Navy arsenal in Florida.

2. Hunting for the Ship of Gold

A crew searches for a shipwreck loaded with gold and sets off a long legal dispute and a lavish complex in the Catskills attracts many of America's great comics.

3. America's Gun Factory

A company town produces weapons that transform the Wild West and a building complex revolutionizes communications on this world and beyond.

4. Nazi Secrets in the Empire State

Visit strange structures in New York where Nazis helped launch the US Space Race and then see a New Orleans amusement park where joy turned to despair.

5. The Vermont Doomsday Gun

A research facility spawns new technology with earth-shattering implications and a coastal haven for African Americans changes the nation.

6. Idaho's Atomic Ghost Town

The remains of Idaho's nuclear industry mark a new era of American history; a distillery in rural Kentucky revolutionizes liquor; a New England settlement prospers despite prejudice; subterranean chambers produce many of the nation's monuments.

7. The Lair of the Mothman

A desert facility trains a nuclear strike force; a church becomes a sanctuary from racial violence; an old military building spawns a creature that haunts a small town.

8. Secrets of the Olympia Brewery

A brewery in the Pacific Northwest sustains prospectors during the Gold Rush; a Wyoming mining settlement descends into lawlessness; a murder in a small Mississippi town sparks a revolution.

9. America's Hidden Training Camp

A Military Base trains soldiers in modern warfare to help defeat the Nazis; a suburban basement becomes a major cog in the Detroit bootlegging scene; a brave woman leads a labor union against organized crime.