The true meaning behind this sculpture remains unknown.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

The Habsburgs' royal collections of art and wonders.

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

Macabre museum devoted to historical Viennese murders.

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

This former insane asylum now holds a pathological anatomy museum.

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

Designed as a reminder of one of the darkest moments in Austrian history.

In the heart of Luxembourg's "little Switzerland" weaves a breathtaking natural sandstone canyon with a mythological past.

Dedicated to a synagogue that was destroyed after having survived World War II.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.

In an area known in Bratislava’s postal history, this sculpture sits equipped with a functional postbox.

A sculpture of the beloved author surrounded by characters from his fairy tales.

No one knows the origin of this creepy little stone man with an oversized phallus.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

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.

Take a seat and hear a song by the composer Frédéric Chopin.

This is part of the Francke Foundation Museum, a curiosity cabinet filled with different scientific and natural wonders.