This ancient spring in central London was featured in a Peter Pan story.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

London's first edible insect farm offers facility tours and cooking classes.

A bronze bust commemorates the heroism of the secret agents who led covert operations against the Nazis.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

Concerts, art, offices, and a café in what used to be Berlin's first crematorium.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

You've probably seen these distinctive orange-tiled columns on the big screen.

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

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

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

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

Started as a kitchen garden, now the second largest botanical garden in the world.

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.

The most visited, and possibly most controversial, museum in Germany.