Berlin's old airport.

This platform is now a memorial dedicated to those who were deported during the Holocaust.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This concrete residential area doubles as an open-air gallery.

A brush maker used his factory to protect blind Jews from the Gestapo.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

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

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

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

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

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

Cold war icon and onetime "hole" in the iron curtain.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

Watch butterflies take flight before you fly.

An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.

An ode to "The Queen of Appalachia."

Practice your Dirty Dancing lifts in the manmade lake where Johnny Castle himself did.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Monument that stands 40 feet and weighs 1,000 pounds.

The first tourist attraction to offer tours for interstellar tourists.

Though considered an eyesore by some, this boxy Brutalist high-rise plays a significant role in Sydney's past.

Be on the lookout for the symbolic insect all over the city.

The last resting place of the famous Native American princess is marked by a haunting monument.