Longfellow House - Washington's Headquarters National Historic Site is closed for general visitation until Spring 2016. It may still be possible to arrange a tour pending staff availability. See the Operating Hours and Seasons page for more information. Special events will continue throughout the winter. Please check 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 event and visitation information.