Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

The prototype for all Nazi concentration camps.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A rather vulgar example of the transition from Latin to the Italian vernacular.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."