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Devils Tower.

Devils Tower is located in north-eastern Wyoming and became the first National Monument in the United States, (1906). The formation is a volcanic intrusion that remains after surrounding sandstone layers eroded away. It rises 1,267 feet (386 m) above the Belle Fourche River and is popular with climbers. The tower is also a sacred site to many Native American tribes.

GRCDevilsTower500px SMugCliffsClimbingCopyrightedJan17Devils TowerGeologyIconicLandscapeMountainsNational MonumentNatureNo PeopleOutdoorsRocksUSAWyoming