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Narrator: There is a place where, every second, more than half a million gallons of water tumbles over towering cliffs three thousand feet wide. A place where it free-falls a spectacular one hundred and seventy feet before plunging into a seething cauldron far below. These thundering waters reflect Nature at its most powerful and most destructive, and its most magical and alluring. This is Niagara Falls. As one of the natural wonders, our love affair with Niagara has spanned the past three hundred years. Once, the Falls' foaming waters were feared and revered. Today, they have been tamed, and we enjoy them from as many vantage points as we can. Yet some are ready to risk death to experience these waters in all their raw power.