One part antique store, one part curiosities hodge-podge.

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

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

An emerald-green grotto just a short trip from Austin.

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

The summer home of the largest colony of bats in the world.

Ruins of a once-opulent grand Victorian resort.

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

A 131-year-old wunderkammer of Texas history.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The creek where a shark wreaked terror upon New Jersey, and served as the inspiration for "Jaws."

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

What is it about mushrooms that makes people wish they lived inside of them?

An abandoned relic of the city's failed experiment with below ground transit.

Where beautiful signs live on forever.

This magnificent Cincinnati graveyard is also a popular public park.

A castle built by an eccentric medieval enthusiast in rural Ohio.

One tree's homage to soles past and present.

A real flying saucer, contracted by the U.S. Air Force.