The largest body of filtered water in the United States is hidden in the middle of Louisville, Ky. Only the people in the four blocks surrounding the quarry, including Matilda Paulin, right, know that it’Äôs there. The pool covers 2.5 acres, contains 3.5 million gallons of water and is enclosed on two sides by forty-foot cliffs. Zachery Treitz, left, dives into the cool water. czrkh "Life on the Cusp"
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