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

An ancient iron pillar in Delhi that seems to be rustproof.

A startling, centuries-old subterranean marvel hides in plain sight.

A blooming house of worship for the masses.

This Jewish bakery, among the last in the region, sells legendary sweets from a century-old storefront.

The world's largest secondhand book market is a haven for bibliophiles and bargain hunters.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The first green space constructed on an elevated viaduct.

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

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

This museum houses an imposing skeleton army comprised of creatures great and small.

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

A haunting collection of the vanished and disappearing natural world.

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

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

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

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

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

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