California's own majestic geyser is powered by a subterranean volcano.

This extraordinary geological oddity resembles human-made pavement.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

Curious rock formations in a tiny Kansas state park.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

Self-built house and sculpture park where the creator can still be seen in a glass coffin.

A unique attraction and museum dedicated to exploring iconic roadside structures.

Over 50 historic windmills whir away at this outdoor museum.

Massive still life just off the highway in Kansas.

At Oklahoma Panhandle State University, a plaque marks a place once known as No Man's Land in the linear world and the fictional Kcymaerxthaere as well.

The United States's largest hand-dug well is topped with a state-of-the-art museum.

Stories of sightless fish and ghostly cowboys are only a fraction of the legends surrounding this Kansas sinkhole.

One man’s hobby is another man’s world of metal wonders.

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

This roadside attraction attracts kids with dinosaurs before blindsiding them with geology.

The pleasant woodland cemetery that has inspired more than its fair share of wild legends.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

The sprawling, eccentric estate of Ames and Ames, a brilliant botanist, and a genius inventor and artist.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

A coastal rock outcrop with mysterious inscriptions variously attributed to Native Americans, Portuguese, Phoenicians, Norse, and more.

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

This historic graveyard monument is dedicated to a tragic victim of witch trial hysteria.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.