Once the tallest building in Chisinau, this unique tower is a relic of Soviet architecture.

Ancient rock-hewn town that witnessed key events of Georgian history.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.

This freshwater spring fills with 10,000 gallons of water per minute.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

These fantastically named natural pools look like something out of a Scottish myth.

Europe's official "zero-level," the equator of elevation.

A unique configuration of blown glass can be found inside this hotel lobby.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

A century-old prison in the heart of Vilnius is now a lively bar, dance club, and artist residency.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

The first Catholic church in Singapore is a Neo-Gothic colossus with a rich architectural history.

A World War II torpedo launch station abandoned off the Polish coast.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

These unique stepping stones hug a river's edge to take hikers on a journey through a limestone gorge.

Notorious artist squat renovated into legal studios.

A collection of abandoned typographic signs from Berlin and beyond.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

She asked for a potato cellar and over the next 23 years he gave her a network of holy caves.

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