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

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

The Habsburgs' royal collections of art and wonders.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

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

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

The first modernist church in Europe.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Double spiral staircases are not unheard of, but they are very rare.

The shell of a medieval fortress offers commanding views of the area it once protected.

The world's oldest grape-producing vine has survived four centuries of turmoil and even has its own anthem.

Touching the iron railings of Tarragona's balcony to the Mediterranean is said to bring good luck.

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

Bridge that died in war and was resurected.

An ancient knight and a symbol of the city's freedom.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

An underground city of salt.

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.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.