Artworks by loners, prisoners and the criminally insane.

A Gothic cathedral created from volcanic rocks.

This church looks more like a spaceship than a house of worship.

The bears of Bern have been a city highlight for over 500 years.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The famous Beatle secretly visited this Illinois town several times to visit his sister.

A mysterious light of unknown origin on the backroads of Missouri.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Dedicated to a synagogue that was destroyed after having survived World War II.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

A sculpture of the beloved author surrounded by characters from his fairy tales.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.