Built in 1754, this single-family home is Washington, D.C.'s oldest residence and can now be bought for $10.5 million. Despite its old age in the District, predating even the Old Stone House, it was originally built in Danvers, Massachusetts as a grand summer home. The first owner, Robert "King" Hooper, was a leading shipowner and merchant in Marblehead, Massachusetts who later lost much of his wealth and stature. According to The Washington Post, Hooper's fall was due to his persistence in sympathizing with the British during the run-up to the Revolutionary War. By the 1930s, two antiques dealers bought the property and sold it to George and Miriam Morris, a prominent District couple at the time.