The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

Every plane, auto, and bicycle in this collection is kept in working order and are regularly demonstrated to the public.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

Practice your Dirty Dancing lifts in the manmade lake where Johnny Castle himself did.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

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

This kitsch eatery is chock-a-block with bric-a-brac.

Watch the newest land on the planet form before your eyes.

A flower grows on this giant stone that is said be able to control minds.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

A daybeacon pyramid is about all that's left of this island that is said to have sunk due to a pirate's curse.

This iconic science fiction house still looks like something from the future.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

The world's smallest drawbridge.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.