Architecture, Building, Outdoors, River, Water, Monastery, Housing, Mountain, Arch, Arched, Cliff, hoover, dam, lake, historic, historic & vintage, national monument, mountains, mountain, tourist attraction, tourist destination, boulder, city, nevada, usa, hoover dam, nv, united states, metropolis, home appliance, district, state, United States of America, America, durables, U.S., american state, barrier, urban area, United States, urban center, vacuum, appliance, north american country, historical, rock