Niagara Falls straddle U.S. and Canadian territories. The most powerful waterfalls in North America, they are a vital source of hydroelectric power. Horseshoe Falls' crestline measures almost half a mile (2,198 feet). The falls drop nearly 53 meters (173 feet). Statistics aside, Niagara Falls are the perfect setting for romance – they are a tremendously popular destination for marriage proposals and wedding ceremonies. (GeoEye High Resolution Imagery)
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