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Natural Bridge State Park is located in North Adams, Massachusetts and is home to a unique and fascinating geological feature. The park's namesake natural bridge is made of 550 million year-old marble and is the only natural white marble arch in North America. It was formed over 13,000 years ago by the forces of glacial meltwater carving through the rock. The natural bridge spans the Hudson Brook as it flows through a steep 60-foot gorge, providing visitors with a stunning example of glacial erosion in New England.