This gentleman farmer's house, built circa 1710 and enlarged in 1760, served as Washington's last wartime headquarters while the Continental Congress met at Nassau Hall. Congress rented the house for Washington's use from August 23 to November 10, 1783. Martha Washington, their personal servants and a guard of 12 to 24 men were here with him. After receiving news of the peace treaty signing, he issued his Farewell Orders to the Armies of the United States here on November 2. This house has been moved three times (twice to escape an encroaching quarry and once for a road). Carefully restored after its last move, Rockingham now occupies a 27-acre site adjoining the Delaware & Raritan Canal, reminiscent of its original location near the Millstone River. Guided tours of the mansion reflect life in Colonial times with 18th century furnishings and artifacts. Tours may also include the Children's Museum and the kitchen garden, with plants and flowers indigenous to an 18th-century farmstead. The Children's Museum, a former Colonial summer kitchen or wash building, now houses games, activities and costumes for children.

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