Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

Step inside Lucy, the world's largest "elephant."

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

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

Civil War Fort on an island in the Boston Harbor.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

A fiery crater has been burning in the Karakum Desert since 1971.

An underground city of salt.

America's post-nuclear-attack chambers of Congress.

Live a night as a Byzantine King, with a minibar and private jacuzzi.

Mediterranean castle on a tiny Turkish island.

Ruins of the Crusaders' headquarters.

This lab's maddening silence is good for business but bad for sanity.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

One of the world's largest collections of rare and magnificent bird specimens.

Play heads or tails with thousands of different coins.