Madison Boulder
Madison Boulder, Madison, NH, USA
About
The largest known glacial erratic in North America, a granite boulder 83 feet long, 23 feet high, 5,000 tons, dropped here by a retreating glacier 14,000 years ago. A short forest road leads 0.25 miles to it, then a loop trail circles the boulder, about a half-mile round trip total. Free. Dog-friendly on leash.
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