Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

This giant temperature attraction created some giant electric bills.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

The museum is housed inside the historic 1863 Carson City Mint.

Home to the "Circus" trees created by Axel Erlandson.

The only surviving prototype of Buckminster Fuller's revolutionary car.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

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

The world's last remaining store of its kind.

A vertically floating hemlock controls the waves and weather at Crater Lake.

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

This abandoned motel doesn't welcome guests anymore, but decay and a creepy atmosphere still call it home.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

This quirky roadside attraction dives into the many theories surrounding North America's most infamous hairy cryptid.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.