Former headquarters of the KGB.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

One of the most important yet well-hidden museums dedicated to the history of medicine.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This lonely cast-iron structure is the only wave-washed lighthouse of its kind left in all of Britain.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

A wildlife paradise, this island is one of the world’s most important habitats for burrow nesting seabirds.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

The final resting place of New Orleans' most famous voodoo priestess.

This historic electric train has operated with regularity since the early 1900s.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

A Prada store in the West Texas desert that is never open for business.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

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

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

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

An eerie, derelict amusement park in Berlin.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

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

Open-air museum with a large collection of Soviet-era statues.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."