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

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.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

A flamboyant five-story building in Bulgaria resembles a crawling snail.

This historic black and white monastery is one of Bulgaria's architectural jewels.

Founded as a refugee camp, now a popular tourist spot.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

The place where World War I began.

One of these two land speed record-breaking vehicles went so fast it shattered the sound barrier.

All that remains of the only English cathedral destroyed in the Protestant Reformation.

A preserved block of timber buildings from the city's industrial era in the Middle Ages.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A Moroccan getaway in the mountain range that plays the Himalayas' stunt double.

God's Saharan sandbox of wrath.

One of the most spectacular canyons in the world.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

Oriental bazaar in the heart of Sarajevo.

This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.

A war-torn Olympic relic is being overtaken by graffiti and nature.