This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

The decaying remains of a once-luxurious Soviet spa town.

Small church on top of a huge rock column.

These Stalin-era industrial 'death traps' hang lifeless above the city

Unusual building appears to be haphazardly built from randomly piled bricks.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

You'll find just about anything in this funky Tbilisi flea market.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

The only quarter of the Old City not dedicated to a major world religion.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

A stunning mosque owes its design to an Ottoman ruler nicknamed "the Butcher."

A lush indoor jungle fills this bustling Madrid transportation hub.

A collection of weird and wonderful art fills a former houseplant nursery.

A tiny basalt mountain with an observation tower overlooking the beautiful Bavarian countryside.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

Rusted cars, trucks, and buses form a fascinating collection of Soviet-era machinery.

An ancient pagan site swirling with legends in the foothills of Franconian Switzerland.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

Somewhere there is a giant who can no longer poop, but now travelers can stay inside his anus.

The castle where Martin Luther secretly translated the New Testament from Greek to German while in hiding.

Legendary site where an evil bishop was devoured by rodents.

The largest brick bridge in the world.