A series of playful yellow penguins share a serious message about the environment.

This artificial cave looks like something out of a fairytale.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

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

Part ski resort, part modern art space, this lodge brings giant metal spiders and bloody doors to the Austrian Alps.

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

"World machine" built by an untrained Austrian farmer.

American soldiers discovered Europe's best one-liner at the end of World War II.

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.

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

An Austrian house of bones filled with hundreds of intricately painted skulls.

Artfully arranged bones of 5,800 Austrians.

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

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

One of the best collections of wax anatomical models in the world.

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

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

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

This museum promotes informed contraception by documenting its often secret past.

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

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