Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

What happens when you cross a mayor and a painter?

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

The cross-shaped memorial is filled with kitschy tributes to the late pop star.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

Stone pillars and a petrified wedding party in the hills of North Macedonia.

The discovery of these rare, ancient artifacts led to the creation of a new museum.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

Vibrant street art created with mixed media.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Infamous and now demolished panopticon prison built by its former inhabitants.

This embalmed man is one of the best preserved mummies from the Canary Islands.

Part of the medieval watchtower is displayed in an otherwise ordinary parking garage.

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

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

A lush indoor jungle fills this bustling Madrid transportation hub.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

The abandoned club hides in the hills of Ibiza.

This 18th-century project to build the world's tallest gravity dam was never completed.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

One of Europe's largest supercomputers is housed inside of a disused chapel.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.