A desert that evokes the surreal.

This red lake 4,000 meters above sea level is home to rare flamingos.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

A seemingly endless landscape of pure salt stretches far across Bolivia.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

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.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

A Serbian church lit by chandeliers made of weapons.

A pair of connected skyscrapers form this symbolic gateway.

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

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

This micro-nation may be some sort of prank, but its constitution sure seems official.

A narrow strip of land is home to the tallest migrating dunes in Europe.