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

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

A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.