Washington’s private homes provide a fascinating window into the city’s history. Begin at the pre-Revolutionary colonial building of the Old Stone House, which shows how early DC citizens lived. Then discover three grand and storied mansions in Upper Georgetown. Visit the remarkable Octagon House; the Hillwood Estate, Museum and Garden of Marjorie Merriweather Post; and Woodlawn Plantation, which became a “free labor colony” with lots owned and farmed by free African Americans.