A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The attic of a four-century-old canal house hides a clandestine church.

The history and future of cannabis.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

Cat art as far as the eye can see.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Museum preserving torture methods from the past.

A curious collection dedicated to human and animal anatomy and pathology.

One of downtown Berlin's last reminders of its Communist past.

When German-Iraqi relations broke down, this embassy was vacated post haste.

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

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

A restaurant and observation deck built in a unique broadcasting antenna.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

This conical hill was built as a testing ground for an engineer known as the Glider King.

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.

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

Floating swimming pool within a moored vessel.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

Berlin's old airport.