Stockholm's deepest subway station is also a stunning ecological wonder.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Apparently, the whole cosmos emanates from this plain concrete tower.

A burnt-out motel with priceless Native American artwork in the basement, redeveloped into apartments.

It's easy to see why this eclectic architectural wonder has been dubbed the "Spaceship House."

This museum shaped like an inflating balloon celebrates the sport’s buoyant achievements.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A church of bones, decorated with 40,000 human skeletons.

A Jenga-style cylindrical tower of books that appears to go on forever.

Europe's second largest ossuary wasn't discovered until 2001.

Macabre astrological automaton clock dating to the late 1400s.

Walk through Czech history in Prague's largest graveyard.

This artificial cave looks like something out of a fairytale.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

A surreal statue honoring Prague's favorite literary son.

Mummified monks and the accidentally interred, in a 17th-century crypt.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

This towering volcanic plug stands out among the dramatic formations that dot this otherworldly desert valley.

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

Albuquerque found the perfect use for tumbleweeds at Christmastime.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.