Dedicated July 24, 1913, the Mason Library Great Barrington was designed by Blanchard & Barnes of New York. Mary Augusta Mason, widow of Captain Henry Hobart Mason, left $50,000 to build and furnish the library, which replaced am earlier one located in a clapboard house that had previously stood on the site. The building was rededicated in April, 2007 after extensive renovations that doubled its size and made it handicapped accessible.