Knollwood: The Grand New Hampshire Estate Where President Taft and Mark Twain Made History

Almost everything about Knollwood is big. At 19,000 square feet, it may be the largest home in New Hampshire and one of the largest anywhere. The main dining room seats 26 people, and the ballroom, which has hosted countless balls, charity events, weddings, and receptions, easily seats 120. The view, worthy of billionaires, is 40 miles.

Its most famous visitor, President William Howard Taft, was literally big,…