Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 337 at the 2010 census. It had its origins in 1883 as a mining town, and has since transformed itself into a resort town, serving the needs of the millions of visitors to Mount Rushmore National Memorial, which is located just beyond city limits.
Discover the best top things to do in The Black Hills, United States including Sylvan Lake, Center Lake, Grace Coolidge Creek, French Creek, Stockade Lake, Legion Lake, Horse Thief Lake, Spearfish City Park, Iron Creek Lake, Long Valley Picnic Area.
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