This maze-like slot canyon is a unique gem within an already fascinating geological area.

One man's vast collection of artifacts and ephemera from matchbooks and postcards to vintage neon signs and cars.

The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

San Francisco's newly reopened hands-on science museum.

The ghostly remains of an accidental sea.

More gold than anywhere else, ever.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

This lab's maddening silence is good for business but bad for sanity.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

New York City's smallest piece of private property.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

Tour the sci-fi-esque reality of governmental disease management.

A castle that was built stone by stone by an eccentric journalist.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

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

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

A whimsical village of unique treehouses resides in a Washington forest.

A monument to the art of slicing people open.

Odd outsider art installations surround a Gold Rush-era ghost town.

An acoustic anomaly with a mysterious cause.