Ключевые слова: architecture, arizona, attraction, big, biggest, black canyon, blue, boulder, colorado river, concrete, dam, desert, destination, electric, electricity, energy, engeneering, extraordinary, franklin roosevelt, generators, historic, hoover, hydro, hydroelectric, hydropower, lake mead, large, location, nevada, old, pipe, plant, power, powerhouse, public, room, route 93, structural, structure, travel, tunnel, turbines, turism, turistic, underground, water,