Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Real bones which are said to have belonged to a Polish dragon.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

During World War II, this rice mill became a Nazi concentration camp.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

A six-ton wedding present for the King of the Scots.

Catacombs turned marketplace.

Eighty million natural history specimens call this gargantuan museum home.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This one has sailed five times as far as Sir Francis Drake's famous ship.

London's smallest police station is barely the size of a phone booth.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

Northern Ireland's Brobdingnagian stepping stones.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.