In Virginia’s Fairfax County, on the fair banks of the Potomac River, George and Martha Washington’s historic mansion still stands, preserved to the year 1799—the last year of Washington’s life. On this virtual reality tool, you can navigate the house without the crowds, taking in the stately outbuildings, the elegant simplicity of the rooms, and the bright wall colors, paintings, and Rococo decorative touches that grace the home of America’s founding father. —E.C.