This modest marker near Notre Dame identifies the very center of Paris.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The celebrated eyesore created by starry-eyed sweethearts.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The famous winding walk at Chartres is surrounded in mystery and myth.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

The bears of Bern have been a city highlight for over 500 years.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

Budapest's Communist-era statues, banished to the suburbs.

Marvel of green building techniques that sings with the wind.

The fully functional, submerged Vanuatu Post Office is definitely one of a kind.