Hoover Dam 胡佛大壩

Located in the Black Canyon on the Arizona-Nevada border, this concrete arch-gravity dam—which stands at a jaw-dropping 726 feet tall—attracts approximately 1 million visitors each year. Funded by Congress during the Depression, the dam controls floods, provides irrigation water and produces hydroelectric power. Photo courtesy of Wikipedia.

這座位于亞利桑那州（Arizona）-內(nèi)華達(dá)州（Nevada）邊界黑峽谷的混凝土拱形重力大壩，以令人瞠目結(jié)舌的726英尺高度站立著，每年吸引了大約一百萬的游客。這座由國(guó)會(huì)在經(jīng)濟(jì)大蕭條時(shí)期修建的大壩，控制著洪流、提供著灌溉用水并且生產(chǎn)著水力發(fā)電的能量。照片由維基百科（Wikipedia）提供。