Two hours south of Charleston, Savannah has the largest urban National Historic Landmark District in the United States. Nearly two dozen public squares highlight the 2½-square-mile preservation zone, most of these miniature parks studded with flowering shrubbery, magnolias and statuary commemorating the city’s historic figures. Fronting these pockets of greenery is an endless procession of homes, churches and commercial buildings constructed in an array of architectural styles ranging from Colonial, Federal and Georgian to Gothic, Greek Revivial and Victiorian.