Meet at the Joseph Caputo Community Center and walk to the nearby Weir at the north end of the Double Arch Bridge in Ossining. There you will descend into the original 1842 brick water tunnel and learn its history. You may wish to visit on your own the nearby new walkway along the Sing Sing Kill under the Aqueduct Arch. Parking is available near the Joseph Caputo Community Center. Address: 95 Broadway, Ossining, NY 10562, just west of Rte. 9/Highland Ave. at the junction of Croton Ave. (Rte. 133) (from Ossining Metro-North Train Station by taxi or 15-minute uphill walk). No reservations necessary. Inquiries: Sara Kelsey, firstname.lastname@example.org or call 646-303-1448.