Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

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

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

Hidden amid the tropical forest in the Caribbean Sea are the decaying ruins of the Cocaine King's luxurious island party home.

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

Enchanting cave with a river crashing through the roof.

A dangling church built over a Colombian gorge.

An explosion of natural color known as "the river that ran away from paradise."

This picturesque mansion has gone from opulent ruin to nature museum.

A swing to dangle you off the very edge.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

An eerie, derelict amusement park in Berlin.

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."