Post office plaque commemorates local resistance to a cult invasion.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

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

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

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

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

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A student driver's nightmare.

One part antique store, one part curiosities hodge-podge.

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

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A Jenga-style cylindrical tower of books that appears to go on forever.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Famously misunderstood wonder of the ancient world

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

A modernist landscape of water and sci-fi concrete.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.