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

The medieval "dragon" on an Austrian city's coat-of-arms comes to life in a fountain.

This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

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.

As the highest point in the Mid-Atlantic range this stratovolcano offers spectacular views.

A lush oasis full of vibrant plants and striking geometric displays.

A shrine-like museum entirely dedicated to soccer superstar Cristiano Ronaldo.

Each year melting snow turns these Austrian hiking trails into scuba zones.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

This abandoned five-star hotel is now a five-star urban exploration destination.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The ancient tomb acts as a calendar that keeps perfect time.

The only gulag ever to exist in socialist Yugoslavia.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

A small memorial to a deadly night in Serbia that shook the world before it was swept under the rug.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

In the hinterlands of Serbia's capital, a giant reflective mushroom houses an aeronautical history of the former Yugoslav republic.

A pair of connected skyscrapers form this symbolic gateway.