The Savannah Historic District is a large urban U.S. historic district that roughly corresponds to the pre–Civil War city limits of Savannah, Georgia. The area was declared a National Historic Landmark District in 1966, and is one of the largest urban, community-wide historic preservation districts in the United States. The district was established in recognition of th…The Savannah Historic District is a large urban U.S. historic district that roughly corresponds to the pre–Civil War city limits of Savannah, Georgia. The area was declared a National Historic Landmark District in 1966, and is one of the largest urban, community-wide historic preservation districts in the United States. The district was established in recognition of the Oglethorpe Plan, a unique model of urban planning begun in 1733 by James Oglethorpe at Savannah's founding and propagated during the first century of the city's growth.