The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Krakow's own version of the Hollywood Walk of Fame.

Seven dragon statues—including one that breathes real fire—are scattered throughout the streets of Krakow.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

A collection of modern and vintage pinball machines housed in the cellar of a 15th-century building.

An underground city of salt.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

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

The beautiful baroque library of the Hapsburg empire.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

A spherical "micro-nation" in the heart of Vienna.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

When you're a great Russian Tsar, even your vomit gets a statue.

This emotive sculpture was originally created for the 1878 World's Fair.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.