Legend has it fairies gathered at the site of this medieval castle.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

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

This narrow fjord-like bay is the largest ria in the Mediterranean Sea.

The Renaissance-era courthouse is a relic from the fortified town's centuries of Venetian rule.

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

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

Where the lovelorn find a home for their sentimental keepsakes.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

This 135-year-old weather station studied the effects of the climate on human health.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

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

Now abandoned, the world's first torpedo factory is crumbling into the sea.

A unique two-level bridge designed to honor a king.

This huge metal monument is slowly being stripped to its concrete skeleton.

This abandoned Croatian stronghold never saw a great deal of conflict but it is still a beloved relic nonetheless.

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

A relic of the Cold War tucked away in the forested hills above Bratislava.