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

This massive library holds what was once the largest book collection in the world.

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

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

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

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

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

The celebrated eyesore created by starry-eyed sweethearts.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

A sprawling Victorian farm that has been surrounded by a capital city is one of Canada's greatest treasures.

These locks on North America’s oldest canal are named after a porcine rock formation.

Artworks by loners, prisoners and the criminally insane.

Florentine Renaissance style building in Switzerland, home to the world's largest taxidermy Great White Shark.

Swiss vineyards in a UNESCO heritage site.

The university library shaped like a giant piece of Swiss cheese.

This long line of cement defensive wedges is named after the famous chocolate bar for obvious reasons.

This famous writer's tombstone is a literary pilgrimage site that was publicly defiled by a rival.

Large Hadron Collider and the Birthplace of World Wide Web.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.