Longfellow House - Washington's Headquarters National Historic Site is open for general visitation until Sunday, October 29, 2017. The site offers a variety of tours, programs, and special events throughout the year. See the Operating Hours and Seasons page for more information. Tour schedules are located on the Guided Tours page. For information on special events, please see the Calendar and What's New sections of this website, sign up for our Email Newsletter, and/or like us on Facebook for the most up-to-date information.