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Beneath a grassy mountain valley in central Colorado lies one of the richest and most diverse fossil deposits in the world, including petrified Sequoia trees.
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Beneath a grassy mountain valley in central Colorado lies one of the richest and most diverse fossil deposits in the world, including petrified Sequoia trees.
The site of a Chiricahua Apache and U.S. military conflict, Fort Bowie National Historic Site remembers U.S. soldiers who settled the western frontier.
Fort Davis, of the best examples of an Indian Wars frontier military post in the Southwest, protected emigrants and transportation on the Chihuahua Trail.
Established as a fur trading fort in 1834, Fort Laramie evolved into the largest and best known military post on the Northern Plains before its abandonment.
Fort Union was established in 1851 as a protector of the Santa Fe Trail, and during its forty-year history, three different forts were constructed in total.
Fossil Butte National Monument, a national park in Wyoming, is a 50-million year old lake bed and one of the richest fossil localities in the world.
The Gila Cliff Dwellings National Monument offers a glimpse into the homes and lives of the Mogollon people who lived there from the 1280s to the early 1300s.
In 1869, the Union Pacific and Central Pacific railroad companies joined 1,776 miles of rail at what's now known as Golden Spike National Historical Park.
This national historic site in Montana commemorates the Western cattle industry from its 1850s inception through recent times.
Hohokam Pima National Monument protected 2,000 inhabitants in 'Snaketown,' village.