On the way to Centennial from Gordon we took a break at Scotts Bluff National Monument.

From the nps website:

Towering eight hundred feet above the North Platte River, Scotts Bluff has been a natural landmark for many peoples, and it served as the path marker for those on the Oregon, California, Mormon, and Pony Express Trails.

Scotts Bluff National Monument preserves 3,000 acres of unusual land formations which rise over the otherwise flat prairieland below.