Copenhagen's celebrated theme park and gardens.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

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.

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

This one-time health resort was used by aristocrats around the world.

A whimsical bridge adorned with decorative dragons.

The "dragon babies" of southeastern Europe.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

Where the lovelorn find a home for their sentimental keepsakes.

A musical instrument played by the sea.

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

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Macabre astrological automaton clock dating to the late 1400s.

With 8,000 pipes this giant instrument is the most versatile theatre pipe organ ever built.

This architectural stunner is one of the few surviving Egyptian Revival theaters in the U.S.

World's second largest particle accelerator, where nature reveals its secrets.

An exhibit of items from the mental institution where Mary Todd Lincoln lived after her son conspired to have her committed.

A replica viking ship from the Chicago World's Fair is still in dry dock in an Illinois park.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.