An architectural marvel that spans the Arda River, and has stories of a haunted past.

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

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

Dive for drinks at Croatia's first and only underwater winery.

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

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

The remains of a sunken military ship wreck visible through clear water.

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

An ethereal glowing blue ocean cave in Croatia.

The remains of an entire Roman city can be explored in this interactive museum.

The massive white mound and accompanying water terraces are a striking geological oddity.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.

An industrial site turned into Hungary's most cherished natural wonder.

A two-way chairlift system between Zugliget and the highest point in the city.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Once the home of a hermetic monk, this cave now houses a small church.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

The ruins of this medieval castle on a foggy hill tell the story of a once-mighty empire.

A Serbian church lit by chandeliers made of weapons.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.