Joint Walk with Rockefeller State Park Preserve and Urban Trail Conference — As part of the New York State Path through History Weekend. Approximately 4-5 miles, loop walk, easy-to-moderate. This walk, mostly on the Old Croton Aqueduct, begins at the ruins of Rockwood Hall, built in 1849 and purchased by Wm. Rockefeller, John D. Senior’s younger brother, in 1886, before John D. began acquiring and building what later became Kykuit. We cross the Archville bridge, which replaced the earlier bridge that carried the Aqueduct over Rt. 9 and served as a carriage trail connecting the two estates. We reach the Rockefeller State Park Preserve, and walk on Rockefeller trails to view a major Aqueduct structure that crosses the Pocantico River. History, birds, botany, and beauty may be anticipated. Meet at the Rockwood Hall (description & directions: http://www.nynjtc.org/hike/rockwood-hall-sleepy-hollow) parking lot behind Phelps Memorial Hospital at 1 pm. Inquiries: Sara Kelsey, 646-303-1448, email@example.com or Urban Trail Conference leader, David Bernstein, 347-224-7376, firstname.lastname@example.org.