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

Berlin's old airport.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

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

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

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

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

This classic restaurant features a gorgeous mirror-clad room.

A slice of central Asia in the middle of Berlin.

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

An eerie, derelict amusement park in Berlin.

The gravestone of the suffragist leader attracted extra visitors during the 2016 election.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

A surreal museum of extraordinary industrial objects.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

A crumbling hospital from the 1850s on Roosevelt Island.

Offbeat arts organization that hosts exhibitions, events, and explorations.

A graffiti Mecca welcoming artists from around the world.

One of only two commuter aerial tramways in the United States.

Steam out your ears for New Year's Eve.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

Tucked in the back of this amazing antique store is an important piece of medical history.

This decrepit abandoned building is made all the more eerie by its dark history.

The youngest volcano in Central America.