The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

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

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

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The iconic castle that withstood a magnitude 6.2 earthquake has become a symbol of resilience.

These Japanese ruins have been brought back to life with elaborately recreated buildings.

The university library shaped like a giant piece of Swiss cheese.

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

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Model Trains and Much More in Hamburg.

The Goose Girl of Göttingen, Germany might well be the most kissed girl in the world.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

Four-story slides send people whizzing through the math department at this Munich university.

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

In this truly magical place, rent hasn't been raised since the year 1520.

A whimsical bridge adorned with decorative dragons.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

The site of Austria's biggest concentration camp now honors its victims.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A giant scale model giving a sneak peek at what urban planners see for Shanghai by 2020.

This historic Chinese tower was said to have been haunted by fox spirits but is now haunted by a grisly murder.

This former textile district now is now a thriving center for contemporary Chinese art.

Walled family complexes in Southern China.