A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

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

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

A silly medieval mural preserved on the side of a Viennese house.

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

The ruins of a fairytale castle with a tumultuous history stand high atop the mountains.

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

A spherical "micro-nation" in the heart of Vienna.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

Op-art architecture designed for happiness.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

Macabre museum devoted to historical Viennese murders.

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

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

The world's largest concentrated solar power plant.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

This grubby wall is said to be one of the Earth's esoteric energy centers.

Real bones which are said to have belonged to a Polish dragon.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.