The magic's in the hole!

The highest point in Washington state is a volcano covered in glaciers.

This egg-shaped treehouse was inspired by "sport sleeping."

Treehouse motel and treehouse-building school.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A clear blue swimming hole with hidden caves, still unexplored.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

A massive underwater sinkhole made famous by Jacques Cousteau.

Remember that scene in the Matrix, when Neo is in the big white room with all the weapons flying by? Well, this is what it would look like if he had wanted trees instead of guns.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Mysterious rocks that ring musically when struck.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Most-visited and most-photographed slot canyon in the American Southwest.

Bohemian paradise covered in majestic forests.

Rustic natural hot springs in the deciduous rain forest.

The largest source of fossilized insects anywhere.

Enormous lake at the bottom of a unique cave system.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

An emerald-green grotto just a short trip from Austin.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".