[1] Landmark name Image Date designated[2] Location County Description 1 1956 Grand Canyon TWA – United Airlines Aviation Accident Site 1956 Grand Canyon TWA – United Airlines Aviation Accident Site April 23, 2014 (#14000280 ) Grand Canyon National Park 36°10′30″N 111°49′59″W / 36.1750°N 111.833°W / 36.1750; -111.833 (1956 Grand Canyon TWA – United Airlines Aviation Accident Site ) Coconino Crash area of first major (100+ deaths) commercial air disaster in the United States; led to creation of Federal Aviation Administration 2 Air Force Facility Missile Site 8 Air Force Facility Missile Site 8 April 19, 1994 (#92001234 ) Green Valley 31°54′05″N 110°59′54″W / 31.901339°N 110.998414°W / 31.901339; -110.998414 (Air Force Facility Missile Site 8 ) Pima Last surviving Titan II missile launch facility; inactive 3 Apache Pass and Fort Bowie Apache Pass and Fort Bowie December 19, 1960 (#72000194 ) Bowie 32°08′46″N 109°26′08″W / 32.146111°N 109.435556°W / 32.146111; -109.435556 (Apache Pass and Fort Bowie ) Cochise Commemorates the conflict between the Chiricahua Apaches and the United States military; preserves the ruins of Fort Bowie 4 Awatovi Ruins Awatovi Ruins July 19, 1964 (#66000187 ) Keams Canyon 35°43′07″N 110°16′37″W / 35.718611°N 110.276944°W / 35.718611; -110.276944 (Awatovi Ruins ) Navajo Ruins of a 500-year-old pueblo visited by Coronado's men in 1540 5 Casa Malpais Site Casa Malpais Site July 19, 1964 (#66000936 ) Springerville 34°09′N 109°18′W / 34.15°N 109.3°W / 34.15; -109.3 (Casa Malpais Site ) Apache Ruin built around 1250; inhabited until about 1400 by Mogollon culture.Tours and museum
6 Mary Jane Colter buildings Mary Jane Colter buildings May 28, 1987 (#87001436 ) South Rim locations in Grand Canyon National Park 36°03′29″N 112°08′13″W / 36.058056°N 112.136944°W / 36.058056; -112.136944 (Mary Jane Colter buildings ) Coconino Includes Desert View Watchtower , Hermits Rest , Hopi House , and The Lookout . 7 Desert Laboratory Desert Laboratory December 21, 1965 (#66000190 ) Tucson 32°13′31″N 111°00′09″W / 32.225278°N 111.0025°W / 32.225278; -111.0025 (Desert Laboratory ) Pima Founded in 1903 to study plant adaptation to an arid desert environment with long term experiments, this laboratory contributed significantly to the formation of Ecology as a science. Part of the University of Arizona 8 Double Adobe site Double Adobe site January 20, 1961 (#66000169 ) Douglas 31°21′00″N 109°32′00″W / 31.35°N 109.53333°W / 31.35; -109.53333 (Double Adobe site ) Cochise Archaeological site where development of the Cochise Culture occurred 9 El Tovar El Tovar May 28, 1987 (#74000334 ) Grand Canyon Village 36°03′21″N 112°08′13″W / 36.055704°N 112.136999°W / 36.055704; -112.136999 (El Tovar ) Coconino Classic lodge at South Rim of Grand Canyon 10 Fort Apache and Theodore Roosevelt School Fort Apache and Theodore Roosevelt School March 2, 2012 (#76000377 ) Fort Apache 33°47′23″N 109°59′21″W / 33.789812°N 109.98903°W / 33.789812; -109.98903 (Fort Apache and Theodore Roosevelt School ) Navajo Site of historic Fort Apache; later converted to a school for the purpose of assimilating the native population. It is now a tribal museum. 11 Fort Huachuca Fort Huachuca May 11, 1976 (#74000443 ) Sierra Vista 31°33′19″N 110°20′59″W / 31.555278°N 110.349722°W / 31.555278; -110.349722 (Fort Huachuca ) Cochise Commemorates "Buffalo Soldiers " 12 Gatlin Site Gatlin Site July 19, 1964 (#66000183 ) Gila Bend 32°58′51″N 112°42′06″W / 32.980935°N 112.701612°W / 32.980935; -112.701612 (Gatlin Site ) Maricopa Preserves a Hohokam platform mound, pit houses, ball courts, middens, and prehistoric canals 13 Grand Canyon Depot Grand Canyon Depot May 28, 1987 (#74000337 ) Grand Canyon Village 36°03′15″N 112°08′11″W / 36.054295°N 112.136346°W / 36.054295; -112.136346 (Grand Canyon Depot ) Coconino Railway station constructed in 1909–10 for the Atchison, Topeka and Santa Fe Railroad 14 Grand Canyon Lodge Grand Canyon Lodge May 28, 1987 (#82001721 ) North Rim , Grand Canyon National Park 36°11′57″N 112°03′07″W / 36.199167°N 112.051944°W / 36.199167; -112.051944 (Grand Canyon Lodge ) Coconino Lodge at Bright Angel Point, on North Rim of Grand Canyon 15 Grand Canyon Park Operations Building Grand Canyon Park Operations Building May 28, 1987 (#87001412 ) Grand Canyon Village 36°03′12″N 112°08′13″W / 36.053226°N 112.136908°W / 36.053226; -112.136908 (Grand Canyon Park Operations Building ) Coconino National Park Service building; built in 1929; designed to blend with the natural surroundings 16 Grand Canyon Power House Grand Canyon Power House May 28, 1987 (#87001411 ) Grand Canyon Village 36°03′14″N 112°08′24″W / 36.053873°N 112.139970°W / 36.053873; -112.139970 (Grand Canyon Power House ) Coconino Rustic building designed to conceal the purpose of the building, which was to provide power to the railroad. 17 Grand Canyon Village Grand Canyon Village February 18, 1987 (#75000343 ) Grand Canyon Village 36°03′20″N 112°08′18″W / 36.055556°N 112.138333°W / 36.055556; -112.138333 (Grand Canyon Village ) Coconino Planned town significant for its urban planning and ecological sensitivity 18 Hoover Dam Hoover Dam August 20, 1985 (#81000382 ) Lake Mead National Recreation Area 36°00′56″N 114°44′16″W / 36.015556°N 114.737778°W / 36.015556; -114.737778 (Hoover Dam ) Mohave, AZ and Clark, NV Historic dam, power plant and water-storage facility 19 Hubbell Trading Post Hubbell Trading Post December 12, 1960 (#66000167 ) Ganado 35°43′32″N 109°35′36″W / 35.725556°N 109.59333°W / 35.725556; -109.59333 (Hubbell Trading Post ) Apache Meeting ground of two cultures, the Navajo and the settlers 20 Jerome Historic District Jerome Historic District November 13, 1966 (#66000196 ) Jerome 34°45′13″N 112°06′41″W / 34.753611°N 112.111389°W / 34.753611; -112.111389 (Jerome Historic District ) Yavapai Copper mining town 21 Kinishba Ruins Kinishba Ruins July 19, 1964 (#66000180 ) Whiteriver 33°48′53″N 110°03′16″W / 33.814722°N 110.054444°W / 33.814722; -110.054444 (Kinishba Ruins ) Gila Large pueblo ruin; accessible via Fort Apache Historical Park. 22 Klagetoh (Leegito) Chapter House Upload image January 13, 2021 (#100006279 ) Klagetoh 35°29′58″N 109°31′48″W / 35.4994°N 109.5299°W / 35.4994; -109.5299 (Klagetoh (Leegito) Chapter House ) Apache 23 Lehner Mammoth-Kill Site Lehner Mammoth-Kill Site May 28, 1967 (#67000002 ) Hereford 31°26′00″N 110°06′00″W / 31.433333°N 110.1°W / 31.433333; -110.1 (Lehner Mammoth-Kill Site ) Cochise Clovis culture mammoth butchering site24 Los Santos Ángeles de Guevavi Los Santos Ángeles de Guevavi June 21, 1990 (#71000119 ) Nogales 31°24′36″N 110°54′10″W / 31.409908°N 110.902689°W / 31.409908; -110.902689 (Los Santos Ángeles de Guevavi ) Santa Cruz Ruins of Spanish mission church; founded 1691 25 Lowell Observatory Lowell Observatory December 21, 1965 (#66000172 ) Flagstaff 35°12′10″N 111°39′52″W / 35.202778°N 111.664444°W / 35.202778; -111.664444 (Lowell Observatory ) Coconino Observatory where Pluto was discovered 26 C. Hart Merriam Base Camp Site C. Hart Merriam Base Camp Site December 21, 1965 (#66000173 ) Flagstaff 35°22′29″N 111°43′34″W / 35.374824°N 111.725990°W / 35.374824; -111.725990 (C. Hart Merriam Base Camp Site ) Coconino Work site of C. Hart Merriam , path-breaking eco-biologist 27 Murray Springs Clovis Site Murray Springs Clovis Site October 16, 2012 (#12001019 ) Sierra Vista 31°34′14″N 110°08′27″W / 31.570638°N 110.140872°W / 31.570638; -110.140872 (Murray Springs Clovis Site ) Cochise Clovis culture site associated with bison and mammoth kills; site open to public.28 Navajo Nation Council Chamber Navajo Nation Council Chamber August 18, 2004 (#04001155 ) Window Rock 35°40′58″N 109°02′54″W / 35.682778°N 109.048333°W / 35.682778; -109.048333 (Navajo Nation Council Chamber ) Apache Center of government for Navajo Nation . 29 Old Oraibi Old Oraibi July 19, 1964 (#66000188 ) Oraibi 35°52′35″N 110°38′25″W / 35.876389°N 110.640278°W / 35.876389; -110.640278 (Old Oraibi ) Navajo Historic Hopi village 30 Painted Desert Community Complex Historic District Painted Desert Community Complex Historic District December 23, 2016 (#100000838 ) One Park Rd. 35°04′06″N 109°46′50″W / 35.068333°N 109.780556°W / 35.068333; -109.780556 (Painted Desert Community Complex Historic District ) Apache 31 Painted Desert Inn Painted Desert Inn May 28, 1987 (#87001421 ) Petrified Forest National Park 35°05′01″N 109°47′20″W / 35.083737°N 109.788845°W / 35.083737; -109.788845 (Painted Desert Inn ) Apache Lodge in the Petrified Forest National Park 32 Phelps Dodge General Office Building Phelps Dodge General Office Building May 4, 1983 (#71000109 ) Bisbee 31°26′25″N 109°54′41″W / 31.440186°N 109.911261°W / 31.440186; -109.911261 (Phelps Dodge General Office Building ) Cochise Phelps Dodge mining company headquarters from 1896 to 1961 33 Point of Pines Sites Point of Pines Sites July 19, 1964 (#66000182 ) San Carlos Apache Indian Reservation 33°21′13″N 109°44′40″W / 33.3535°N 109.7445°W / 33.3535; -109.7445 (Point of Pines Sites ) Graham Set of archaeological sites associated with Anasazi, Mogollon and Hohokam cultures; location is site of archaeological field camp 34 Poston Elementary School, Unit 1, Colorado River Relocation Center Poston Elementary School, Unit 1, Colorado River Relocation Center October 16, 2012 (#12001010 ) Parker 33°59′31″N 114°24′24″W / 33.991943°N 114.406625°W / 33.991943; -114.406625 (Poston Elementary School, Unit 1, Colorado River Relocation Center ) La Paz Located at the former Poston War Relocation Center , this is the only surviving elementary school building from any World War II -era Japanese internment camp . 35 Pueblo Grande Ruin and Irrigation Sites Pueblo Grande Ruin and Irrigation Sites July 19, 1964 (#66000185 ) Phoenix 33°26′47″N 111°59′03″W / 33.446389°N 111.984167°W / 33.446389; -111.984167 (Pueblo Grande Ruin and Irrigation Sites ) Maricopa Pueblo Grande Ruin and adjacent Hohokam-Pima Irrigation Sites 36 Sage Memorial Hospital School of Nursing Upload image January 16, 2009 (#09000082 ) Ganado 35°42′40″N 109°32′36″W / 35.711073°N 109.543446°W / 35.711073; -109.543446 (Sage Memorial Hospital School of Nursing ) Apache 37 San Bernardino Ranch San Bernardino Ranch July 19, 1964 (#66000170 ) Douglas 31°20′11″N 109°16′47″W / 31.336389°N 109.279722°W / 31.336389; -109.279722 (San Bernardino Ranch ) Cochise Historic cattle ranch 38 San Cayetano de Calabazas San Cayetano de Calabazas December 14, 1990 (#71000118 ) Nogales 31°27′09″N 110°57′34″W / 31.4525°N 110.959444°W / 31.4525; -110.959444 (San Cayetano de Calabazas ) Santa Cruz Spanish mission, also known as Calabasas ; part of Tumacácori National Historic Park. 39 San Xavier del Bac Mission San Xavier del Bac Mission October 9, 1960 (#66000191 ) Tucson 32°06′25″N 111°00′29″W / 32.107°N 111.008°W / 32.107; -111.008 (San Xavier del Bac Mission ) Pima Spanish mission founded in 1699 40 Sierra Bonita Ranch Sierra Bonita Ranch July 19, 1964 (#66000181 ) Bonita 32°35′00″N 109°58′00″W / 32.583333°N 109.966667°W / 32.583333; -109.966667 (Sierra Bonita Ranch ) Cochise and Graham First permanent American cattle ranch in Arizona 41 Snaketown Snaketown April 29, 1964 (#07001462 ) Hohokam Pima National Monument 33°10′59″N 111°55′12″W / 33.183056°N 111.92°W / 33.183056; -111.92 (Snaketown ) Pinal Archaeological remains of the Hohokam culture 42 Taliesin West Taliesin West May 20, 1982 (#74000457 ) Scottsdale 33°36′11″N 111°50′38″W / 33.603111°N 111.843781°W / 33.603111; -111.843781 (Taliesin West ) Maricopa Winter home of architect Frank Lloyd Wright 43 Tombstone Historic District Tombstone Historic District July 4, 1961 (#66000171 ) Tombstone 31°42′45″N 110°03′59″W / 31.7125°N 110.066389°W / 31.7125; -110.066389 (Tombstone Historic District ) Cochise Classic Western mining boomtown; location of the OK Corral 44 Tumacacori Museum Tumacacori Museum May 28, 1987 (#87001437 ) Tumacacori 31°33′58″N 111°03′01″W / 31.566065°N 111.050402°W / 31.566065; -111.050402 (Tumacacori Museum ) Santa Cruz Museum to Spanish missions that itself is an architectural landmark 45 Ventana Cave Ventana Cave January 20, 1964 (#66000189 ) Santa Rosa 32°21′00″N 112°14′00″W / 32.35°N 112.233333°W / 32.35; -112.233333 (Ventana Cave ) Pima Archaeological site; has evidence of Native American occupation of the area for the last 4,000 years 46 Winona Site Upload image July 19, 1964 (#66000177 ) Winona 35°12′00″N 111°24′00″W / 35.200°N 111.400°W / 35.200; -111.400 (Winona Site ) Coconino Archaeological site; evidence of cultural change following eruption of Sunset Crater 47 Yuma Crossing and Associated Sites Yuma Crossing and Associated Sites November 13, 1966 (#66000197 ) Yuma, AZ and Winterhaven, CA 32°43′43″N 114°36′52″W / 32.728611°N 114.614444°W / 32.728611; -114.614444 (Yuma Crossing and Associated Sites ) Yuma County, AZ and Imperial County, CA Archaeological and historical sites including Yuma Quartermaster Depot and Arizona Territorial Prison 
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