European castle ruins in an American state park are actually the product of death and grief.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

See massive fossils that are over 200 million years old in northeastern Arizona.

A museum dedicated to the alleged Roswell Incident.

The trials and tribulations of marking Poe's grave.

The largest earthwork effigy in the world.

Seattle's own bad art museum located inside Cafe Racer.

New York City's smallest piece of private property.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

The curiosities and wonders of pharmacy in a delightful historic building.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Tour the sci-fi-esque reality of governmental disease management.

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

These eerie outliers of the lightning bug family glow a mysterious blue color.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Odd outsider art installations surround a Gold Rush-era ghost town.

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

All that's left of the quintessential "cabin in the woods."

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

A collection of Witchcraft artifacts and occult paraphernalia started by the leader of the Long Island Coven.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.