First summited in 1725, what is the most-climbed mountain in the United States?

Henry David Thoreau and Ralph Waldo Emerson were enamored with Mount Monadnock, whose summit is such a gradual slope at 3,166 feet, that around 125,000 people climb it annually. It's said to be one of the world's most climbed mountains, although Mount Fuji in Japan sees some 400,000 summit it annually.

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