Annual technopop celebration of peace and love.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Narrow-gauge railway with its own personal power grid.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

The solemn exterior conceals an opulent interior of this 17th century church.

A pyramid in Central Europe of unknown origin.

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

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

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

This outsider art house has gone from clinical creation to astounding artwork.

Fantastic stories on a miniature railroad.

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

Apartment complexes built into huge repurposed natural gas tanks.

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

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

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

This cubist Vienna church building looks like some sort of alien stonehenge.

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

The world's oldest known salt mine.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

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

Op-art architecture designed for happiness.

A spherical "micro-nation" in the heart of Vienna.