The site of a famous samurai duel.

After visiting hours, this picturesque waterfall is essentially turned "off" to be used for hydroelectric power.

Buy a token from the liquor store and you can make this beast spew flames on command.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

This interpretive path lets you get up close and personal with dinosaur bones.

An abandoned town is hidden in Great Smoky Mountains National Park.

This lesser-known geographic marker was the reference point for all surveys of the continent for 75 years.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

No one knows the meaning behind this giant sculpture of a nude woman with a fork riding a rooster in Havana.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

Astounding collection of coin-operated games and automata.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

Weighing 30,000 pounds, this monument represents Detroit's first industrial era.

Dilapidated Mayan-themed ballroom was one of Detroit's most popular venues through the 40s.

Standing guard on top of an old, vacant ice cream shop.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

The bones of an old zoo crumbling in the shadow of a new one.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

A Beaux-Arts triumph set to become Ford's innovation campus