This unattributed sculpture in Amsterdam is hiding in plain sight.

A set of seven houses, each built in a style that represents a European country.

This plaque marks the former home of one of the first women physicians in the Netherlands.

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

Christ's blood allegedly preserved in a Belgian town.

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

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

One of the world's largest collections of medieval religious art.

This enormous 32-foot painting depicts Poland's greatest medieval battle in glorious detail.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

A 15-foot-tall statue of the head of the Sopranos family greets passengers at a train station in southeastern Lithuania.

The Frank Zappa fan club erected this monument to their prog-rock hero to mark a new era of post-Soviet Lithuania.

A century-old prison in the heart of Vilnius is now a lively bar, dance club, and artist residency.

Over time, this castle grew to encompass the entire island.

A miraculous three-handed portrait of a saint can be found inside this church.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

This micro-nation may be some sort of prank, but its constitution sure seems official.

The former Field Marshall and Minister of War to the Russian Imperial Army.

With a design inspired by traditional Latvian textiles, this monument honors the Latvian people who suffered under Soviet occupation.

A statue built to honor the elite soldiers who fought for Latvia during World War I.

The Master of Magnetism dominates the walls of a scrap metal yard to keep graffiti artists at bay.

There aren't too many operational funiculars around, but Pittsburgh has two!

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.