One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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

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.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

The most visited, and possibly most controversial, museum in Germany.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

A slice of central Asia in the middle of Berlin.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

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

A Hungarian pharmacy museum with a box full of mummy powder.

The fairy tale castle of the "fairy-tale king."

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Unable to build support structures on glaciers, the engineers for this tramway were forced to design a unique system.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

A medieval village holds a very modern hotel.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.