The narrow passages will challenge even the bravest driver.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.

Why walk on this historical site when you can zoom down instead?

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

World's first "penitentiary," meant to be humane, drove men insane.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

A sacred mountaintop temple offers a fine cup of tea to visitors who can survive the journey.

This massive subterranean fissure is known as the "underground Grand Canyon."

Deep in the Thar desert, a temple crawling with thousands of holy rats.

A seemingly endless landscape of pure salt stretches far across Bolivia.

This deceptively salty lake looks like blushing pink lemonade.

The world's second-largest sundial, made entirely out of stone.

A curious cave church carved into the face of a cliff.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.