TIME: 11:00 a.m.LOCATION: Prospect Park Meet at the Audubon Center (East Drive and Lincoln Road) Public transportation: Take the Q or B Train to Prospect Park station, or the B-41 bus to Flatbush Ave. and Ocean Ave, or the B-43 bus to Ocean Ave. and Lincoln Rd., or the B-48 bus to Lincoln Rd. BrooklynDETAILS: Discover the beauty of Prospect Park's unique arches and bridges. Learn the names and histories of these features that play a large role in Olmstead and Vaux's design. Fun for all ages. FREE.For more information please visit www.nyc.gov/parks/rangers or call 311 and ask for the Urban Park Rangers.