Zone One is the Historic Center, (Centro Histórico), lying in the very heart of the city, the location of many important historic buildings including the Palacio Nacional de la Cultura (National Palace of Culture), the Metropolitan Cathedral, the National Congress, the Casa Presidencial (Presidential House), the National Library and Plaza de la Constitución (Constitution Plaza, old Central Park). Efforts to revitalize this important part of the city have been undertaken by the municipal government.