Free, easy, 2-hour tour. Meet at the benches in front of the Joseph Caputo Center, which is located at 95 Broadway, Ossining, NY 10562, just west of Rte. 9/Highland Ave. at the junction of Croton Ave. (Rte. 133) (from Metro-North Ossining Train Station by taxi or 15-minute uphill walk). After a brief walk, descend into the Weir in Ossining and explore the original 1842 brick water tunnel and learn its history.  Required: pre-registration (limited number); bring masks, and social distancing. Walk may be rescheduled if weather does not cooperate.