One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The house that took a plunge into the facade of a museum.

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

The world's most important buildings shrunk to a tiny size.

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

Apartment complexes built into huge repurposed natural gas tanks.

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

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

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

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

The world's oldest known salt mine.

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

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

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

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Gargoyle head that brings good luck.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.