The tony, leafy neighborhood of Georgetown along the Potomac River in Washington, D.C. has been influential in American history since the 18th century when it was a thriving seaport. But during the Cold War, following World War II and up until the end of the 20th century, it was home to the Capitol's most influential players in government, spycraft, journalism, and the arts. Within less than a square mile were located the red brick Federal era homes...