Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

A once grand hotel is being retaken by the wilderness it once capitalized on.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

Pompeii's less famous neighbor is still revealing her secrets.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

A beautiful but toxic fountain of mercury.

The hallucinogenic center of the ancient world.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

The Grand Canyon of Texas.

A 300-ship graveyard, with a few still visible at low tide.

A short hike into the mountainside forest reveals a decaying 1890s town.

More than five miles of underground passageways.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The longest living non-clonal organisms on Earth.

This former coal gasification plant found a curious second life as a popular public park.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?