Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

The resting place of a Civil War celebrity's amputated limb.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

The site of one of history's most indelible and horrific tragedies.

Step inside Lucy, the world's largest "elephant."

World War II bunker still standing on the New Jersey beach.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

This abandoned amusement park was built on a site with a dark history.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

At 207 feet, one of the world's longest continuous escalators.

The site of the climactic scene from the classic horror film is now a historic landmark.

The United States Capitol's former columns still stand.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

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

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

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

The loneliest island in New York.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.