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

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

The interior of this Serbian royal family's mausoleum is covered with exquisite mosaics.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

Ride in 1960s style on the private luxury train Marshal Josip Tito used to travel around Yugoslavia.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

A darkly erotic open-air statuary in Catalonia.

Abandoned waterpark turned counter-culture mecca.

An arcade packed with a rotating collection of unique independent video games.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.