This Colorado fire station has been in continuous operation for more than a century.

A once-thriving hotel from the Old West now sits abandoned, under the threat of demolition.

A historic gristmill that still produces flour and grits the old-fashioned way.

This lovely burial mound is actually a replica that was installed after archeologists excavated the original.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

Hidden behind Lincoln's head is a chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

This towering wooden Sasquatch was carved with a chainsaw.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

You thought Santa Claus didn't exist, but it turns out you were wrong.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

Within the former ghost town of Cisco is a carefully restored tiny town with one resident and its own art residency.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

Dad jokes and wordplay abound in this comic fake cemetery.

This unusually circular centenarian barn became a Route 66 icon.

One of the largest Masonic temples in the world, created at the height of the oil boom in ostentatious style.

William Faulkner kept his beloved estate wild and untamed.

The world's longest known cave system.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Where animatronic singing fish go to retire.

148 feet long and in the middle of a verdant forest.

Amazing taxidermy dioramas from the 1960s in a cement building meant to look like an ice cave.

An abandoned theme park with a strange and tumultuous past.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.