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America's top 10 landmarks

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9 - Niagara Falls: Straddling the border between Ontario and New York, this massive waterfall can move 6 million cubic feet of water per minute during high flow. As well as being a popular tourist attraction, the falls provide hydroelectric power. The riverflow generates about 4.4 million kilowatts of electricity.

PHOTO: Mary Knox Merrill/The Christian Science Monitor

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