A surrealist timepiece by the artist of melting clocks.

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

This massive library holds what was once the largest book collection in the world.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Hamburgers are intensely proud of their tunnel beneath the river.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

A lovely biographical museum in the artist's home of 24 years.

A little sculpture with a large wardrobe.

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

The facade of this 16th-century building is decorated with carvings of 300 seashells.

The Spanish king's private bathroom embraced the idea of a porcelain throne.

At least according to the Guinness World Records.

A window into a long-lost world, these colorful tiles advertise a long-defunct range of purgative teas, harmless smokables, and diarrhea cures.

Spain's largest bullring offers a unique glimpse at architecture and history.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This 19th-century fountain's namesake animal isn't what you think it is.

Barça football fans might see the insignia hidden in a church window as a divine sign.

Giant topiary dog once played a role in a terrorist bomb plot.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.