The Boston Masonic Building is the headquarters of the Grand Lodge of Massachusetts - organized in 1733, it is the oldest Grand Lodge in the Western Hemisphere and the world's third oldest. Built in 1899, it is an historic building with magnificent architecture. Open to the public, visiting the Boston Masonic Building is a great way to learn about Freemasonry and the men who helped shaped Boston, the Commonwealth, and the country. Learn more at MassFreemasonry.org. Free tours offered Monday, Wednesday & Friday at 10:30 am and 2 pm or by calling (617) 426-6040 to make special arrangements.