List of National Historic Landmarks in Arizona

Columns: Landmark name | Date designated | Location | County | Description
15 | 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 | 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 | 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 | 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 | 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 | 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

Example questions:
What is the Arizona County with a population of 211,073 known for ? | The first commercial airline crash to result in more than 100 deaths took place in what Arizona county ? | The historic site that contains the ruins of a pueblo estimated to be 500 years old is in what Arizona county ? | The historic Arizona town that was founded as a mining camp associated with copper deposits is in what location ? | Where is the historic Arizona landmark founded by the Carnegie Institution in 1903 located ?

Answers:
Copper mining town | Coconino | Navajo | Jerome | Tucson 32°13′31″N 111°00′09″W / 32.225278°N 111.0025°W / 32.225278 ; -111.0025 ( Desert Laboratory )