An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A garden of flying flowers.

A moving memorial to the fallen and missing from WWI trenches.

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

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

The highest point in Belgium is a staircase to nowhere.

Brussels' favorite peeing boy has a sister.

Christ's blood allegedly preserved in a Belgian town.

A little sculpture with a large wardrobe.

Theme park featuring miniature replicas of European monuments.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

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

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Blitzkrieg bop your way through Berlin's Ramones Museum.

A brush maker used his factory to protect blind Jews from the Gestapo.