This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Apartment complexes built into huge repurposed natural gas tanks.

3,000 market stands in five former Zeppelin hangars.

Budapest's Communist-era statues, banished to the suburbs.

Berlin's old airport.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

Macabre astrological automaton clock dating to the late 1400s.

Clusters of huge boulders in the Australian Outback.

An opal mining town in the middle of Australia where people live, worship, and shop underground.

Microscopic fossils suggest Australia may be the birthplace of sulphur-based life forms.

Alien rock formations grown from the sands of an Australian national park.

An eerie, derelict amusement park in Berlin.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

The world's oldest known salt mine.

An Austrian house of bones filled with hundreds of intricately painted skulls.