An eye-catching collection of graffiti covered structures that were once a pioneering entertainment attraction now stand derelict in the Mojave Desert; experts investigate and reveal the revolutionary remnants of America's first waterpark. Further segments of the episode portray the Smith Mansion in Wyoming, the Threatt Filling Station in Oklahoma, and the Miami Marine Stadium in Florida.

A curiously designed, windowless building adorned with gold tinted diamond shapes now stands derelict in Tulsa; experts investigate and uncover a controversial religious figure and the headquarters behind a pioneering form of American TV evangelism. Further segments of the episode portray the Kreischer Mansion in New York, the Mid-South Coliseum in Tennessee, and Michigan Central Station.

A monstrous airplane that helped America reach new, historic heights sits decommissioned in Tucson, Ariz.; experts investigate and reveal one of the most important aircraft of the 20th century and its contribution to the Apollo spaceflight program. Further segments of the episode portray the North Wilkesboro Speedway in North Carolina, the Potomac River Defences in Maryland and Virginia, and Fort Hunt in Virginia.

A sprawling military facility dotted with bunkers for miles now stands abandoned in the American heartland of Edgemont, S.D.; experts investigate and uncover a once highly-secure WWII ordnance site designed to store deadly munitions. Further segments of the episode portray the Brushy Mountain State Penitentiary in Tennessee, Wolf House in California, and Pueblo Bonito in New Mexico.

A derelict ghost town shows a curious revitalization along an iconic highway in the Mojave Desert; experts investigate and reveal a once thriving and bustling Route 66 stopover that’s being resurrected into a historic Americana destination. Further segments of the episode portray Murphy Ranch in California, the Belle Isle Zoo in Michigan, and the Charleston Navy Yard and Navy Medical District in South Carolina.

A historic sea vessel rusts in the Delaware River; experts investigate and reveal a passenger liner and the architecture that doubled as a U.S. warship. Further segments of the episode portray the Idlewild vacation resort in Michigan, the Bolinas Transmitting Station in California, and the Cahokia Mounds in Illinois.

A beloved hospital in the Big Easy was once the site of heroic efforts by medical staff and volunteers to evacuate patients after Hurricane Katrina in 2005. Left in ruin, the historic Charity Hospital is being revitalized by another major New Orleans institution, Tulane University.

An upstart mining town fuels the American war effort in both World Wars with its bountiful deposits of lead and zinc; the dusty remains of the mining efforts that put Picher on the map would condemn the city to abandonment years later.

A railroad enterprise once built this company town for its workers to live in, but when thousands of employees went on strike, the military intervened; the history of the complex remains as relevant as ever.

This bowling alley was once the site of a fatal struggle for desegregation.

This secluded Georgia plantation marks a dark chapter in American history.

An unassuming factory marks a seismic leap forward in how humans travel.

A rural town in Oregon is taken over by an eccentric cult.

Alabama's first capital goes bankrupt after hosting a Revolutionary leader.

Forgotten soldiers of the Old West guard a fort at the southern border, pirates plunder a major salmon provider, a mountaintop hotel hosts both presidents and revolutionaries, and an American legend springs from a humble Alabama home.

A labor strike in an Arizona mining town ends in a mass kidnapping and deportation.

A rundown nature park is full of strange secrets and connections.

The National Guard puts down a prison riot in the Great Plains and an abandoned mining facility in Alaska marks a pivotal chapter in the gold rush.

An old mining town in Wyoming provides sanctuary for Amelia Earhart, a hotel in the Deep South becomes a historical crossroads, and a forgotten Connecticut theater hides secrets beneath the surface.

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

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.

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

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.

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

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.