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Wissahickon Valley Park is a 1,800-acre forested gorge within Philadelphia's city limits, offering 80 km of trails along Wissahickon Creek. It is one of the most remarkable urban wilderness areas in the United States.
The valley was a center for mills and industry in the 1700s and 1800s. After the mills closed, the city incorporated the land into Fairmount Park in 1868. Today the forest has fully regenerated, concealing all traces of its industrial past.