Natural Bridge State Park (Massachusetts)

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Natural Bridge State Park is a Massachusetts state park located in North Adams, in the northwestern part of the state. It contains the only natural white marble arch/bridge in North America. Its natural bridge, which spans Hudson Brook, was formed by glacial melt by 11,000 BC, from 550 million year old bedrock.

Formerly the site of a marble quarry (1810-1947) and privately-owned tourist attraction (1950-1983), the site became a state park in 1985. The arch and associated quarry have long attracted attention from hikers, including Nathaniel Hawthorne in 1838, who wrote of it (among other local features) in his An American Notebook.

The park is open from Memorial Day through Columbus Day, 9:00 am to 5:00 pm.