Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

No one knows exactly how deep the world’s deepest geothermal hot spring is.

A Prohibition-era casino once hidden as a palatial tea room.

Of course the grave of JFK's assassin is surrounded by conspiracy theories.

The man who wasn't there.

A modernist landscape of water and sci-fi concrete.

Berkeley Springs State Park boasts the nation's only monument commemorating presidential bathing.

Cathedral carved out of salt, located a mile below the Earth's surface.

This narrow street is packed with street vendors and bars selling chicha.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

An unsettling sculpture of a boy hanging out in a street in Ghent has been baffling visitors for years.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Rotterdammers' dirty minds gave this Santa a dirty nickname and cursed it to a life of wandering.

One man's quest to save his town with a trail of record-breaking sculptures.

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A bright little alley in La Boca is a part of tango history.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."