Hidden in the garden of physicist Erwin Schrödinger's house is a life-size figure of a cat from his famous thought experiment.

Community bookshelf of 25-foot-tall book spines.

Explore the subjective dream of a hotel.

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

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

An unusual number plate signifies the building's saucy past.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

Got apples?

An all-American grocery store in Paris sells U.S. "cuisine" like Pop-Tarts and Heinz ketchup to homesick ex-pats.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

The first green space constructed on an elevated viaduct.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

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

19th century pendulum and a clock restored by a rogue group of guerilla artists.