Inwood Hill Park contains the last natural forest and salt marsh in Manhattan, New York City. It is unclear how the park received its present name. Before becoming parkland in 1916, it was known during the Colonial and post-Revolutionary War period as Cock or Cox Hill. In the 17th and 18th centuries, colonists from Europe settled and farmed here. During the Revolutionary War, American forces built a five-sided earthwork fort in the northwestern corner of the park.