Two gems of Beaux Arts architecture that have been sitting vacant for years.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

A pyramid commemorates the birthplace of James Buchanan, the 15th president of the United States

A small 19th-century graveyard tucked away in the middle of a suburban neighborhood.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

Remnants of a storybook amusement park hidden behind a strip mall.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

The Cadillac Ranch for monster truck aficionados.

Bizarre Cavern.

A Civil War Museum with some notable medical antiques.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

A giant time capsule not scheduled to be cored until 2040.

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

This 1830s store is believed to be the site of Harriet Tubman's first stand.

The eerie ruins of a remote abandoned hamlet said to be founded by the survivors of a shipwreck.

This stunning home looks like it belongs in medieval Europe, not North Carolina.

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

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The home of pigs, snakes, chameleons, and the alleged largest bunny in the United States.

Ruins of an American Civil War iron forge still survive today.

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

The wooded estate of the Forest Service employee responsible for D.C.’s cherry blossom trees.