This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

Centuries-old bridges grown from tangled roots.

Last stop before the top of the highest peak in the world.

Dark, eerie exhibits make for a surreal exploration of the subconscious.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

A Stalinist prison camp for the wives and children of men accused of betraying the Soviet state is now a memorial museum.

An abandoned Soviet-era mining town in the mountains of South Kazakhstan.

Rusting ships sit in a desert where a sea used to be.

Anatomical cabinet holds unexpected treasures.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

A massive underwater sinkhole made famous by Jacques Cousteau.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.