In this beautiful county is the world-famous Devils Tower National Monument, which is in the Bear Lodge Mountains, and the Missouri Buttes, found in the northwestern end of the Black Hills. The area's large white tail deer and turkey population attract large numbers of out-of-state hunters to the area. During the World War I era, many homesteaders put down roots here. With Montana to the north and South Dakota to the east, Crook County is home to more than 3,000 households and 437 businesses. In the Cold War era of the late 1950s, the United States Air Force established a radar installation powered by the world's first air transportable atomic power plant atop Warren Peak in Crook County. There is Keyhole State Park and Reservoir, Crook County, West Texas Trail and Hulett Museums.