Mysteries of the Abandoned: Hidden America - Season 4

A worldwide communications facility is taken over by a dangerous cult, a secret arsenal harbors the most destructive weapons ever known, and an ordinary inn has a surprising history.

A crew searches for a shipwreck loaded with gold and sets off a long legal dispute, a lavish complex in the Catskills attracts many of America's great comics, and a zoo full of metal sculptures marks the spot where war once came to Colorado.

A company town produces weapons that transform the Wild West; a building complex revolutionizes communications on this world; an old mine bears the scars of a deadly labor conflict; a forest hides the remains of a socialite's mansion.

A strange structure in New York becomes a testing ground for Nazi technology; a thriving amusement park is laid to ruins by an unstoppable force of nature; an island becomes a major player in a controversial industry.

A research facility (Space Research Corporation in Jay, Vermont) spawns new technology with earth-shattering implications;  a coastal haven for African Americans (American Beach, Florida) changes the nation; a forgotten fortress (Fort Greene at Point Judith, Rhode Island) fights off the Nazi submarine U-853; a staunch building (the old San Francisco Mint built in 1874) stands firm on the city's darkest day.

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.

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.