The Georgian house at 105 Brattle Street was built in 1759 for John Vassall Jr., a wealthy Loyalist whose family wealth was tied to Caribbean sugar and enslaved labor. Enslaved people lived and worked on the Cambridge estate; Darby Vassall was born there and later gained freedom during the Revolution. The house stands on land with a much longer history connected to the Massachusett people. Its layered past should begin before either George Washington or Henry Wadsworth Longfellow arrived. Rooms, gardens, and records hold evidence of unequal power as well as the lives of celebrated occupants.

After the Vassalls left Cambridge, the mansion became part of the American military landscape surrounding British-held Boston. Washington arrived in July 1775 to take command of the Continental Army and made the house his principal headquarters until April 1776. From here he worked with officers to organize troops from different colonies, obtain supplies, strengthen positions, and plan the siege. Staff, servants, visitors, and messengers made the residence a working military office as well as a home. Martha Washington joined him during the winter, while the army's actions outside the mansion shaped daily decisions within it.

The poet Phillis Wheatley sent Washington a poem during the war, prompting an exchange that connects the headquarters to Black authorship and the era's contradictions about liberty. Washington's command coincided with continuing enslavement in America, including his own ownership of enslaved people. After the British evacuation of Boston, the house returned to civilian use. Andrew Craigie later owned it and altered the property. These changes prevent a visitor from reading every surviving room as it appeared during Washington's stay, even though original fabric and documentation still support careful interpretation of the headquarters period.

Henry Wadsworth Longfellow first lived in the house in 1837 and later made it a family home with Frances Appleton Longfellow. His study and the family collections reflect writing, translation, reading, and international correspondence. The household also connects to nineteenth-century reform and abolition debates. The poem 'Paul Revere's Ride' helped shape popular memory of the Revolution, tying the home's later literary history back to the conflict associated with Washington. Descendants preserved furnishings, art, books, papers, and the garden, leaving an unusually rich record of domestic and intellectual life.

The National Park Service manages the house and grounds as Longfellow House–Washington's Headquarters National Historic Site. Its interpretation distinguishes Vassall ownership, enslaved labor, the army's headquarters, later residents, and family preservation. The garden can be visited under posted access rules; free guided house tours follow a seasonal schedule and require checking current arrangements. In 2026 tours run from late May into October, with limited capacity. This is an original surviving house whose changing interiors and collections make it possible to examine how a single address acquired multiple meanings across colonial, revolutionary, and literary generations.