An artificial crater field that trained astronauts for lunar exploration.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

This road winds through the steep coastal cliffside offering spectacular views for those who brave the drive.

A sobering account of the vibrant multicultural neighborhood that was destroyed under apartheid.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Vast network of air raid tunnels beneath Lombardy's capital.

Nestled in the heart of Milan is a real wunderkammer of morbid curiosities.

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

Metro station with a claim to rock n' roll fame.

A monument to the man who almost killed Hitler.

Berlin's oldest surviving academic architecture hosted decades of animal dissections.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A wunderkammer of mysterious objects and stories.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

An eerie, derelict amusement park in Berlin.

A slice of central Asia in the middle of Berlin.

Bacteria and algae give the salty water its bubblegum hue.