A tiny church on a man-made island in the Adriatic.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

An abandoned brutalist monument whose history has been lost to the ages.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

Bridge that died in war and was resurected.

These warring psychedelic crags commemorate an unsuccessful military operation.

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

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

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

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

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

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

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.

A musical instrument played by the sea.

An ethereal glowing blue ocean cave in Croatia.

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

An abandoned Jewish sanatorium is tucked within the woods of Poland.

A national collection of Communist-era musical posters.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Warsaw's fantastically preserved gasworks...almost.