"Reveille in Washington, 1860-1865," by Margaret Leech. It's the story of Washington and the way people lived during the war. It's a very interesting, thorough account. I read those sorts of regional histories for my research, but I would recomend this to any history or war buff.
And "Historic Shrines of America," by John T. Faris. It was published in 1918. It gives the physical history and background on the owners of 120 homes. This is a fascinating book.