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

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

Lavish royal estate punctuated with heated greenhouses.

One of the world’s longest pedestrian suspension bridges.

This star-shaped military outpost is now simply trying to protect itself from neglect.

Elaborate tile work in this railway station tells the story of Portugal.

Perhaps the most spectacular grotto along the Algarve coastline.

This abandoned five-star hotel is now a five-star urban exploration destination.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

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

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

A submerged village appears when dam levels drop.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This giant sculpture made of trash is a critique of society's wastefulness.

This castle has links to Portugal’s founding and struggles for independence.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

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

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

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.