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This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Pennington County, South Dakota, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a map.
Pages in category "Towns in Pennington County, South Dakota" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes .
Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States.The population was 240 at the 2020 census. [5] 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 the Mount Rushmore National Memorial, which is located just beyond the town limits.
There are 16 National Historic Landmarks (NHLs) in South Dakota, one of which is shared with Iowa and listed by the National Park Service as primarily in that state. They have been designated in 13 of South Dakota's 66 counties. Most are along rivers, long the chief areas of human settlement in this arid place.
Pennington County has a total area of 2,784 square miles (7,210 km 2), of which 2,777 square miles (7,190 km 2) is land and 7.7 square miles (20 km 2) (0.3%) is water. [10] It is the third-largest county in South Dakota by area, and is larger than the state of Delaware.
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The largest spodumene crystal in the world was found in the mine. Until about 1900, Etta had the only post office in the Keystone area, and by that time, its population was 24. [3] In the 1920s, the mining operations flourished. [2] The mine shut down in 1959, and the town was eventually abandoned. [4]
This page was last edited on 21 February 2022, at 13:51 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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