[ 1] Landmark name Image Date designated[ 2] Location County Description 1 Ames Monument Ames Monument October 31, 2016 (#72001296 ) Sherman 41°07′52″N 105°23′53″W / 41.131111°N 105.398056°W / 41.131111; -105.398056 (Ames Monument ) Albany A pivotal and highly significant work in the career of Henry Hobson Richardson .[ 3] 2 Expedition Island Expedition Island October 18, 1968 (#68000056 ) Green River 41°31′23″N 109°28′16″W / 41.523°N 109.471°W / 41.523; -109.471 (Expedition Island ) Sweetwater Expedition Island is a park in Green River, Wyoming that marks the area where Major John Wesley Powell started an expedition down the Green River and Colorado River in 1871. 3 Fort D.A. Russell Fort D.A. Russell May 15, 1975 (#69000191 ) Cheyenne 41°09′59″N 104°51′46″W / 41.166389°N 104.862778°W / 41.166389; -104.862778 (Fort D.A. Russell ) Laramie In 1867, the fort was established to protect workers for the Union Pacific Railroad . In 1871, it was base to the Pawnee scout battalion.[ 4] 4 Fort Phil Kearny and Associated Sites Fort Phil Kearny and Associated Sites December 19, 1960 (#66000756 ) Story 44°31′56″N 106°49′35″W / 44.532222°N 106.826389°W / 44.532222; -106.826389 (Fort Phil Kearny and Associated Sites ) Johnson Fort Phil Kearny was an outpost of the United States Army that existed in the late 1860s in present-day northeastern Wyoming along the Bozeman Trail .[ 5] 5 Fort Yellowstone Fort Yellowstone July 31, 2003 (#03001032 ) Yellowstone National Park 44°58′30″N 110°41′53″W / 44.975°N 110.698056°W / 44.975; -110.698056 (Fort Yellowstone ) Park Fort Yellowstone is a former United States Army base created in 1888 to guard the park. It became administrative headquarters of Yellowstone National Park .[ 6] 6 Heart Mountain Relocation Center Heart Mountain Relocation Center September 20, 2006 (#85003167 ) Ralston 44°40′18″N 108°56′47″W / 44.671667°N 108.946389°W / 44.671667; -108.946389 (Heart Mountain Relocation Center ) Park An internment camp for Japanese-Americans during World War II 7 Hell Gap Paleoindian Site (48GO305) Upload image December 23, 2016 (#100000877 ) Guernsey vicinity 42°24′30″N 104°38′22″W / 42.408223°N 104.639407°W / 42.408223; -104.639407 (Hell Gap Paleoindian Site (48GO305) ) Goshen 8 Horner site Upload image January 20, 1961 (#66000758 ) Cody 44°33′21″N 108°59′39″W / 44.555833°N 108.994167°W / 44.555833; -108.994167 (Horner site ) Park Non-public archaeological site yielding evidence of a flint tool culture, with occupation dating back to 5000 BC .[ 7] 9 Independence Rock Independence Rock January 20, 1961 (#66000757 ) Casper 42°29′37″N 107°07′46″W / 42.493611°N 107.129444°W / 42.493611; -107.129444 (Independence Rock ) Natrona Independence Rock is a large granite rock, approximately 130 ft (40 m) high, which served as a landmark on the Oregon Trail and California Trail in southwestern Natrona County.[ 8] 10 Jackson Lake Lodge Jackson Lake Lodge July 31, 2003 (#03001039 ) Grand Teton National Park 43°52′39″N 110°34′36″W / 43.8775°N 110.576667°W / 43.8775; -110.576667 (Jackson Lake Lodge ) Teton Designed by architect Gilbert Stanley Underwood and completed in 1955, the lodge built in International style represents a break from the traditional rustic style of architecture used by the National Park Service. 11 Lake Guernsey State Park Lake Guernsey State Park September 25, 1997 (#80004051 ) Guernsey 42°18′14″N 104°46′10″W / 42.303889°N 104.769444°W / 42.303889; -104.769444 (Lake Guernsey State Park ) Platte Model Civilian Conservation Corps -built state park buildings and structures 12 Lake Hotel Lake Hotel February 27, 2015 (#91000637 ) North side of Lake Yellowstone St., Yellowstone National Park 44°32′59″N 110°24′00″W / 44.549722°N 110.4°W / 44.549722; -110.4 (Lake Hotel ) Teton 13 Medicine Mountain Medicine Mountain August 29, 1970 (#69000184 ) Lovell 44°49′32″N 107°55′15″W / 44.8255556°N 107.9208°W / 44.8255556; -107.9208 (Medicine Mountain ) Big Horn Site of a native American medicine wheel, used for healing and religious purposes 14 Murie Ranch Historic District Murie Ranch Historic District February 17, 2006 (#98001039 ) Grand Teton National Park [ 9] 43°39′02″N 110°43′37″W / 43.650556°N 110.726944°W / 43.650556; -110.726944 (Murie Ranch Historic District ) Teton A group of several cabins in Grand Teton National Park that were owned by naturalist Olaus Murie , his wife Margaret Murie and scientist Adolph Murie and his wife Louise in the 1940s. 15 Norris, Madison, and Fishing Bridge Museums Norris, Madison, and Fishing Bridge Museums May 28, 1987 (#87001445 ) Yellowstone National Park 44°43′27″N 110°42′21″W / 44.72424°N 110.70578°W / 44.72424; -110.70578 (Norris, Madison, and Fishing Bridge Museums ) Teton and Park Three "trailside museums" in National Park Service Rustic style within Yellowstone National Park 16 Obsidian Cliff Obsidian Cliff June 19, 1996 (#96000973 ) Yellowstone National Park 44°49′08″N 110°43′40″W / 44.8189°N 110.7278°W / 44.8189; -110.7278 (Obsidian Cliff ) Park An exposure of obsidian (volcanic glass). It was a notable source of lithic materials for prehistoric peoples. 17 Old Faithful Inn Old Faithful Inn May 28, 1987 (#73000226 ) Yellowstone National Park 44°27′28″N 110°49′49″W / 44.45784°N 110.83031°W / 44.45784; -110.83031 (Old Faithful Inn ) Teton National Park Service architecture 18 Oregon Trail Ruts Oregon Trail Ruts May 23, 1966 (#66000761 ) Guernsey 42°15′22″N 104°44′58″W / 42.256111°N 104.749444°W / 42.256111; -104.749444 (Oregon Trail Ruts ) Platte One half mile long section of Oregon Trail , worn 2–6 feet into sandstone ridge 19 J. C. Penney Historic District J. C. Penney Historic District June 2, 1978 (#78002830 ) Kemmerer 41°47′41″N 110°32′09″W / 41.794722°N 110.535833°W / 41.794722; -110.535833 (J. C. Penney Historic District ) Lincoln Buildings associated with James Cash Penney 's founding of J. C. Penney department store chain here. 20 Quebec 01 Launch Control Facility Quebec 01 Launch Control Facility December 11, 2023 (#100009836 ) Chugwater vicinity 41°32′35″N 104°54′05″W / 41.5430°N 104.9015°W / 41.5430; -104.9015 (Quebec 01 Launch Control Facility ) Laramie Now a state historic site; launch control facility for a Cold War-era missile complex 21 Sheridan Inn Sheridan Inn January 29, 1964 (#66000762 ) Sheridan 44°48′25″N 106°57′12″W / 44.80683°N 106.95333°W / 44.80683; -106.95333 (Sheridan Inn ) Sheridan Inn operated by Buffalo Bill Cody 22 South Pass South Pass January 20, 1961 (#66000754 ) South Pass City 42°22′12″N 108°54′49″W / 42.37°N 108.913611°W / 42.37; -108.913611 (South Pass ) Fremont This was the easiest crossing point of the Continental Divide during the 19th century, serving American pioneers , fur traders , and miners . The access it offered to the Pacific Northwest greatly strengthened the U.S. claim to that region. 23 Tom Sun Ranch Tom Sun Ranch December 19, 1960 (#66000753 ) Casper 42°26′36″N 107°13′06″W / 42.443333°N 107.218333°W / 42.443333; -107.218333 (Tom Sun Ranch ) Carbon and Natrona Tom Sun Ranch was a typical medium-sized ranching operation of the open range period in the 1870s-80s. Tom Sun was a French-Canadian cattleman and frontiersman . 24 Swan Land and Cattle Company Headquarters Swan Land and Cattle Company Headquarters July 19, 1964 (#66000760 ) Chugwater 41°45′17″N 104°49′10″W / 41.754828°N 104.819328°W / 41.754828; -104.819328 (Swan Land and Cattle Company Headquarters ) Platte The surviving buildings include the ranchhouse, barn, and commissary, for this company organized in Scotland in 1883.[ 10] 25 Union Pacific Railroad Depot Union Pacific Railroad Depot February 15, 2006 (#73001934 ) Cheyenne 41°07′54″N 104°48′51″W / 41.131667°N 104.814167°W / 41.131667; -104.814167 (Union Pacific Railroad Depot ) Laramie Railroad depot and related buildings. 26 Upper Green River Rendezvous Site Upper Green River Rendezvous Site November 5, 1961 (#66000763 ) Daniel 42°52′21″N 110°02′20″W / 42.872505°N 110.038819°W / 42.872505; -110.038819 (Upper Green River Rendezvous Site ) Sublette Location of several Rocky Mountain Rendezvous , a 1,200 acres (490 ha) site on the Green River 27 Wapiti Ranger Station Wapiti Ranger Station May 23, 1963 (#66000759 ) Wapiti 44°27′50″N 109°36′58″W / 44.46388°N 109.61613°W / 44.46388; -109.61613 (Wapiti Ranger Station ) Park First U.S. Forest Service ranger station 28 Wyoming State Capitol Wyoming State Capitol May 4, 1987 (#73001935 ) Cheyenne 41°08′23″N 104°49′12″W / 41.13983°N 104.81992°W / 41.13983; -104.81992 (Wyoming State Capitol ) Laramie Current state capitol building