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.

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

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.

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.

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

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

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

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 rundown nature park is full of strange secrets and connections.

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

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 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.

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.

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.

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.