Structure built from the skulls of vanquished foes.

A forgotten and crumbling Yugoslav monument to the victims of fascism.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

This hauntingly beautiful cemetery outside a medieval citadel is full of winding paths and ivy-covered graves.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

This once-derelict building is now one of the most beautiful bookstores in the world.

This snug medieval lane is one of the narrowest streets in the world.

Massive still life just off the highway in Kansas.

A unique gallery chronicles the losers of American presidential history.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

One of England's most famous churches hides a pair of little known architectural treasures.

This unique, full-sized copy of the Bayeux Tapestry sports a few modern additions, including underwear.

The oldest badlands in North America, Makoshika State Park takes it name from the Lakota words for broken land.

This small, but beautiful waterfall has attracted visits from artists, composers, and two United States presidents.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

A whimsical sensor instrument for Minneapolitans to play on their walks to work.

20,000 pieces in a Frank Gehry-designed building.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

This surreal memorial/cemetery is a necropolis of crumbling stonework and puzzle-shaped headstones.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

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