Founded 50 years before the federal capital of Washington, D.C., Georgetown got its start as a gritty port city on the banks of the Potomac River. Despite very modest beginnings, the area eventually came to have the most expensive and desirable property in the District. Carolyn Muraskin, founder of DC Design Tours, reveals the highlights and secrets of the city’s most exclusive neighborhood, home to palatial mansions, notable cemeteries, stately churches, and a world-class university.