George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

Wedged between two sets of row houses is an awkwardly located family graveyard.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

A Civil War Museum with some notable medical antiques.

An eerie, decaying ghost town destined to fade into the forest.

The trials and tribulations of marking Poe's grave.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

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.

Outsider art meets paleontology at this roadside reptile repository.

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.