A dangling church built over a Colombian gorge.

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

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

Former drug lord’s manor, now a theme park. Watch out for the hippos.

One of the largest, oldest, darkest, quietest motel rooms in the world.

Gold Rush-era tombstones line the park's paths.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

A gallery of underwater art that can be visited by man and fish alike.

A tiled, multi-level garden of survival in Lyon.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

The beautiful baroque library of the Hapsburg empire.

An ancient monastery, a locked room, and a mysterious book heist.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

This series of Scottish caves has no clear purpose other than baffling historians.

The world's first experimental nutritionist is memorialized as the "Hippocrates of naval medicine."

A church that bred legends, and served as an inspiration for the Da Vinci Code.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

The private clubhouse for the members of the Academy of Magical Arts.