Editing Madison, New Hampshire (section)

===Madison Boulder Natural Area===

[[Image:Boulder, Madison, NH.jpg|thumb|left|''Madison Boulder'' {{circa|1922}}]]
The town is home to the Madison Boulder ({{coord|43|55|52|N|71|10|04|W|display=inline|type:landmark_region:US-NH}}), the largest known [[glacial erratic]] in [[New England]], and among the largest in the world. Madison Boulder is a huge [[granite]] rock measuring {{convert|83|ft|m}} in length, {{convert|23|ft|m}} in height above the ground, and {{convert|37|ft|m}} in width. It weighs upwards of 5,000 tons. A part of this roughly rectangular block is buried, probably to a depth of ten to twelve feet. It is located at [[Madison Boulder Natural Area]] in the northwest part of town.<ref>{{cite web|title=Madison Boulder Natural Area|url=https://www.nhstateparks.org/visit/state-parks/madison-boulder-natural-area.aspx|publisher=NH State Parks|access-date=February 17, 2017}}</ref> In 1970, Madison Boulder was designated as a [[National Natural Landmark]] by the National Park Service.<ref>{{Cite web
|url=https://www.nps.gov/subjects/nnlandmarks/site.htm?Site=MABO-NH
|title=National Natural Landmarks - National Natural Landmarks (U.S. National Park Service)
|website=www.nps.gov|language=en
|quote="a rectangular granite boulder is the largest known glacial erratic in North America."
|access-date=March 24, 2019}}</ref>