Rediscovered underground chapel is one of the best examples of Gothic architecture in Vienna.

A neo-gothic statue modeled on German Emperor Kaiser Wilhelm II, which had its distinctive mustache shaved off by Nazis in World War II.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

This small window display is dedicated to the noble carrot.

The highest point in Belgium is a staircase to nowhere.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

A monumental golden thumb rises as an iconic homage to Nouveau Réalisme, bold in scale and unapologetic in spirit.

Every half hour the eye-rolling clock face sticks out its tongue to mock the good citizens of Koblenz.

This fountain of a little boy that spits on passersby at erratic intervals is a town icon.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This 12th-century castle majestically overlooks the city and the beautiful Mosel River valley.

Below the altar in Saint-Willibrord Basilica rests the mortal remains of Luxembourg's patron saint.

Some believe that the artist behind this whimsical statue inserted his own likeness as a way to discreetly flip the bird.

The last bastion of Roman presence north of the Alps looms over a German town.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

The medieval woodcut-style artwork chronicles life in medieval London.

Hear the quietest sound from across the dome.

Eighty million natural history specimens call this gargantuan museum home.

Rebuilt remains of a temple to Roman god Mithras.

A thin golden line commemorates the deadliest terrorist attack in recent German history.