A huge musical instrument played by the ocean.

Once the largest town in eastern Yuba County now sits abandoned.

Hidden inside a gift shop that doubles as a museum, this gargantuan yo-yo can only be operated by crane.

A train tunnel that was made obsolete by the dam it helped create.

A picturesque example of brute-force engineering conquering nature.

California's first suspension bridge.

The oldest orange tree in California spawned a generation of citrus farmers.

Home of what was the largest hydraulic mine in the world, producing gold and the first diamonds in the U.S.

Festival of Perpetual Life and Rebirth.

The oldest hotel in West Virginia is reportedly frequented by ghosts.

The first KFC is on the National Register of Historic Places.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

This popular pitstop lives up to its name.

The world-record holder for the longest bridge stretching continuously over water.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

A Masterpiece with a Tragic History.

The neighborhood of Eagle Rock is named after a gigantic boulder with a shadowy surprise.