This historic Chilean cemetery is the burial place of hundreds of European and American freethinkers and non-Catholics.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

An alchemist's "magic door" stands in the middle of a Roman park.

A walkable map of the world, made from soil and stone by one man.

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

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

Slum Settlement Filled With Mountains of Garbage.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

The curious underground history of keeping Paris clean.