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

A unrivaled and rather horrifying collection of wax dermatological models.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

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

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

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

France's national museum of scientific and industrial instruments.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Paris' linguistic guide to the international language of, yes, love.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

France's most famous cemetery, with some of its most curious tombs.

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

Notorious artist squat renovated into legal studios.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

A B-17 bomber stands as a memorial to the residents of Tulare County who served in World War II.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

Look closely and you’ll notice that the color changes a third of the way up the tower.

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.