Madison Boulder State Wayside – Madison, New Hampshire

The Madison Boulder is one of the largest known glacial erratics in North America and among the largest in the world; it is preserved in the 17-acre (6.9 ha) Madison Boulder Natural Area in Madison, New Hampshire. The boulder is a huge granite rock measuring 83 feet (25 m) in length, 23 feet (7.0 m) in height above the

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