A star fort along the C&O Canal in western Maryland that protected America in three wars.

Built by the patriotic residents of Boonsboro in a single day.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A toxic ghost town sitting atop a massive coal fire.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

One of the only memorials dedicated to journalists who died in combat.

Bizarre Cavern.