Millions of dollars worth of sculpture decorate this Iowa city center.

Piled high inside this warehouse and coffee shop are salvaged goods that span every corner of the globe.

The magazine keeps a perfectly groomed display garden for its photo shoots.

A downtown filled with nearly deserted historic buildings was revived as a pastel paradise.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A wunderkammer of mysterious objects and stories.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

An eerie, derelict amusement park in Berlin.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Stuck in a bygone era, the oldest subterranean shopping street in Japan hides beneath the popular Asakusa district of Tokyo.

From pink dolphins to underwater cities, this museum explores the unseen, mythical world of the Amazon river.

The wreckage of a crash that killed nine people still litters the Franklin Mountains.

A unique collection of old miners' cave homes carved in to the hillside cliffs near Death Valley.

High in the Sacramento Mountains, a facility dedicated to studying the sun.

This mountain tram provides stunning views while hanging from a single, steel thread.

A Bhutanese temple gifted from the isolated Himalayan kingdom is now a surprising cultural gem located at the University of Texas at El Paso.

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

This little-known national museum houses over 40,000 works of art from across the world.

One man's remarkable private collection of art from around the world.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

A charming Spanish village sits atop this natural limestone overpass.