One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

Go inside to really appreciate this 500-year-old technological masterpiece.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

Berlin's old airport.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Abandoned railway line circling the city of Paris.

Old Danish castle immortalized in Shakespeare's Hamlet.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

An Austrian house of bones filled with hundreds of intricately painted skulls.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Op-art architecture designed for happiness.

Banished from town, this local jester concocted a clever return.

A jazz band formed by African water animals in the heart of Flemish Brabant.

A fascinating and enormous collection of natural history exhibits stained by a dark colonial legacy.

A man throwing a giant severed hand towers over Antwerp’s main square.

A giant bug impaled on a 75-foot-tall needle.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.