A museum dedicated to the former country.

A well preserved medieval fortress in Vojvodina.

The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

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

Where the lovelorn find a home for their sentimental keepsakes.

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

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

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

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

Bridge that died in war and was resurected.

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.

This surreal memorial/cemetery is a necropolis of crumbling stonework and puzzle-shaped headstones.

The sad remains of a monument to martial arts legend and movie star Bruce Lee—in the middle of Balkans.

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

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.

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

Just a few miles from Novalja, a strange geological oddity has left scientists baffled.

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

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

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A musical instrument played by the sea.

Beloved children's TV characters freckle the German city's streets.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.