Baroque celebration of the end of the Great Plague of Vienna.

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

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Solitary monument dedicated to the beauty of nature.

Featuring a meatless buffet fit for kings, this family-owned Zurich eatery is considered the oldest vegetarian restaurant in the West.

The oldest housing complex in Riga is a mini timeline of architectural trends.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

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

A musical instrument played by the sea.

An ancient octagonal weather station named for the eight Greek gods of wind.

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.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Countless grotesque faces stare out from this eerie Prague art wall.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Macabre astrological automaton clock dating to the late 1400s.

A Jenga-style cylindrical tower of books that appears to go on forever.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A road that winds through this natural cave is the only way to access the small, appropriately-named village of Cuevas.