The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This secluded ruin was once a home for exotic plants.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

Volunteer-run library dedicated to exploring five decades of activism history.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A wunderkammer of mysterious objects and stories.

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

The site of good faith and good nature in the fictional world of Kcymaerxthaere.

One of the world's heaviest musical instruments towers within a popular urban park.

A portable, wooden replica (minus the hyphen) of Hamburg’s iconic crooked coffee shop.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

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

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.

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

A surreal museum of extraordinary industrial objects.

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

A slice of central Asia in the middle of Berlin.

An eerie, derelict amusement park in Berlin.

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

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

Check out a shovel along with your Shakespeare.