The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The highest bridge in America was built for an almost unnervingly small amount of money.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

This demon atop the Notre-Dame de Paris looks utterly bored.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The video game-themed street art first popped up in the French city.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

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

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

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

This geodesic gallery holds a collection of painted spheres that make traditional canvases look lazy by comparison.

A fitting attraction for the corn capital of the world.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

Just a man taking his prehistoric pet for a stroll.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Europe’s most powerful hot spring supplies the surrounding region with hot water.