Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Be(w)ar(e) the moat around this historic Czech castle.

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

Trimmed trees grow alongside the graves like topiary tombstones.

Colorful concentric circles honor a small Croatian town's supposed spot at the nucleus of it all.

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

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

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

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.

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

A striking symbol of the Bulgarian capital.

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

The place where World War I began.

Oriental bazaar in the heart of Sarajevo.

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

Bridge that died in war and was resurected.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

Climb inside an iron crystal magnified 165 billion times its normal size.

The site of Austria's biggest concentration camp now honors its victims.