Paris' fabled purveyor of exotic taxidermy and natural history curios.

Indents in the pavement are all that remain from a grisly death machine in Paris.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

A haunting collection of the vanished and disappearing natural world.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Notorious artist squat renovated into legal studios.

The final resting place of many of Germany's most famous communists.

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

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

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

A wunderkammer of mysterious objects and stories.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A slice of central Asia in the middle of Berlin.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

A long-closed church turned into a saintly skate park.

This giant wire frame man sculpture is crouched in contemplation.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

This unattributed sculpture in Amsterdam is hiding in plain sight.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.