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

Back in the tiny USSR.

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

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Rock carving created 1,300 years ago 75 feet off the ground.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

An abandoned saucer-shaped monument in the Bulgarian mountains.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

The most visited, and possibly most controversial, museum in Germany.

Where once there was a train station bathroom, there is now this German burger joint.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

This former insane asylum now holds a pathological anatomy museum.

Wax models of disease and deformity are on display at this German medical museum.

One of the best collections of wax anatomical models in the world.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

A Nazi concentration camp and Anne Frank's place of death.

This unique Renaissance castle was turned into a home for Nazi occultism.