These half-buried combine harvesters just off Route 66 are an homage to the Cadillac Ranch.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The top of a giant mesa, just outside of Amarillo, appears to float in the sky above.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

A small car graveyard sits in the shadow of the famous Cadillac Ranch.

Calidum et Deliciose Succosum!

Seth Bullock, the sheriff of Deadwood, built this town immediately after Teddy Roosevelt’s death in 1919.

An entire city block built completely out of petrified wood.

This monument remembers one of the manliest men of the frontier who fought a grizzly before dragging himself 200 miles to safety.

The first declared National Monument in the United States.

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

One man's quest to save his town with a trail of record-breaking sculptures.

Despite monuments in other locations, this spot in a South Dakota field is recognized by the U.S. National Geodetic Survey as the center of the 50 states.

This simple badlands butte is the highest point in North Dakota and may be the only high point to charge admission.

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

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

The highest point in Oklahoma used to be a lawless outlaw's paradise.

This marker identifies the location where three states converge.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

Once named the “world’s oldest gas station” due to its unusual construction material.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

The world's largest sticker ball weighs in at a mighty 231 pounds.