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Ipswich River Wildlife Sanctuary. The Massachusetts Audubon Society's Ipswich River Wildlife Sanctuary has trails through marshland hills, where there are remains of early colonial settlements as well as abundant wildlife. Make sure to grab some birdseed and get a trail map from the office. Enjoy bridges, man-made rock structures, and other surprises on the Rockery Trail. 87 Perkins Row, southwest of Ipswich, 1 mile off Rte. 97, Topsfield, MA, 01983. 978/887–9264. www.massaudubon.org. $4. Hrs vary seasonally.