This huge pile of volcanic boulders hides a stunning network of secret grottoes.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

A massive underwater sinkhole made famous by Jacques Cousteau.

These spooky and unusual stone formations create an underworldly landscape.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

This simple apartment may have inspired some of the most important theories in the history of science.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

An aluminum skeleton brings Chinese mythology to the French shore.

Moss and stone turn this waterfall into an otherworldly liquid veil.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

A record-breaking pool that uses computers to turn ocean water into cleaner, private swimming water.

A dangling church built over a Colombian gorge.

A swing to dangle you off the very edge.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

Death road of Bolivia.

Festival of Perpetual Life and Rebirth.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.