This bridge's unique architecture honors nautical heritage and encourages self-awareness.

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

Apartment complexes built into huge repurposed natural gas tanks.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

The only surviving piece of Copenhagen's 16th-century defensive wall.

Visitors are treated to a stained glass kaleidoscope interior inside this work of art.

The world's first combination ski slope and power plant.

This ordinary street was made infamous by a legendary visit from the devil.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

On high feast days, the entire blue-glass front of this modern church opens up to reveal the small wooden church inside.

A subterranean display of public art and architecture.

A small square plaque marks a failed assassination attempt that could have changed history.

One of the most easily accessible examples of the rare 1960s UFO houses.

The footprint of a frustrated devil in Munich's Cathedral.

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

The largest fountain in Bratislava.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

An impressive monument to Poland's independence.

A tribute to the first human in space.

A cluster of headless, armless sculptures looms within a popular Polish park.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.