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

The oldest stone house in Paris was built by its most famous alchemist.

The abandoned remains of this Victorian brewery hide crumbling bowling alleys and rusting industrial gear.

Blitzkrieg bop your way through Berlin's Ramones Museum.

A museum dedicated to a Cold War era sausage.

Taste freshly foraged yarrow and black locust blossoms at this ambitious cocktail bar.

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

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

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

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

Berlin's old airport.

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

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Where once there was a train station bathroom, there is now this German burger joint.

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

An eerie, derelict amusement park in Berlin.

These century-old townhouses contain some of the first car garages built in the United States.

A Collegiate Gothic quadrangle that surrounds an 18th century secondary school whose financing came from the likes of Alexander Hamilton and Aaron Burr, among others.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

One of only two remaining Victorian-era greenhouses in New York.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

This recipe is set in stone.

The painter who popularized "bulls" and "bears" as symbols for the stock market didn't get a proper headstone for over a century.