Super-heavy Nazi architectural experiment.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Berlin's old airport.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

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

A 12th-century fortress containing some of Berlin's oldest buildings.

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

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

A 15-foot-tall statue of the head of the Sopranos family greets passengers at a train station in southeastern Lithuania.

This witch statue remembers a time in England's history when fear trumped truth.

A stone obelisk towering over the surrounding countrysides beckons hikers across the rolling moors.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

Locals spent years successfully fighting to save this beloved Brutalist behemoth from demolition.

A quiet memorial to those who died saving others in the heart of the City of London.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

A museum wholly devoted to juvenescence.

Don't worry, they don't use antique scissors.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.