A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

Town full of spiritualists, some of whom are mediums, is still in full swing after 130 years.

Toxic waste disaster that founded the Superfund program.

Ruins of a once-prized railroad station in New York.

A historic home with ties to the abolition and suffrage movements.

An abandoned asylum where patients have been forgotten but their possessions remain.

Home on the Hillside, and home of the first breakfast cereal.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

This underwater old Texas hill town only resurfaces during harsh drought.

Civil War dumping ground for the bodies of terrorized Union sympathizers.

On a dusty county road sit the ruins of a ghost town's abandoned church.

No one is sure why this mysterious tradition started.

Three hundred years of preserved Spanish colonial history in San Antonio.

A tall smoke stack and boarded-up buildings are all that's left of the pioneering plant.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Colorado's only true geyser is hidden within the San Juan National Forest.

The ruined remains of a coal mining ghost town are hidden within the woods.