Daily jousts and dancing barrel makers in Munich's mechanical clock.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

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

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Apartment complexes built into huge repurposed natural gas tanks.

Legends surround an ancient tree trunk riddled with nails for good luck.

Baroque celebration of the end of the Great Plague of Vienna.

Op-art architecture designed for happiness.

This cubist Vienna church building looks like some sort of alien stonehenge.

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

This Costa Rican chapel is the most metal church in the world, literally.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

This ultra-modern burial building would have stacked the dead like a giant filing cabinet.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

One of downtown Berlin's last reminders of its Communist past.

Berlin's old airport.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.