Photo by NCinDC.Located at 9th and M Street NW, this house’s most famous resident was the pretty amazing Blanche K. Bruce. Bruce, a man born into slavery, was the first (and only) former slave to serve as a U.S. Senator. The house, built in 1865, is a French Second Empire style dwelling (PDF), with a brick facade and arched Romanesque windows. The house is now a National Historic Landmark and on the National Register…