A whimsical bridge adorned with decorative dragons.

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

This massive subterranean fissure is known as the "underground Grand Canyon."

Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A former church turned museum, complete with changing exhibitions.

This military tunnel dates back to World War II and provides visitors with a little wartime adrenaline.

Humble beginnings for one of the world's most famous scientists.

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

The remains of the last Bosnian fortress to fall to the Ottomans are still standing.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

The place where World War I began.

A monument on the pavement marks the spot where two cultures that shaped Sarajevo come together.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

This enormous abstract sculpture is part jungle gym, part elaborate noise-making machine.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

In 1914, Archduke Franz Ferdinand spent his final night alive at this luxurious hotel.

Bridge that died in war and was resurected.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

Longest fortress system anywhere in Europe.

Does this church in Naples hold the true tomb of Vlad the Impaler, the notoriously cruel figure who inspired Bram Stoker's Dracula?

This monument is dedicated to a young boy who survived a disaster that forced Edinburgh to reevaluate its building codes.

The colorful stairs are made with marble from the world's major quarries.