It's free to go into this building used for government business, just leave your passport at the entrance which is on Calle de Moneda. It will be there when you finish your visit! Includes museums on Aztec history as well as the history of the National Palace. Murals by Diego Rivera, painted between 1929 and 1935, gardens, courtyards and a chapel are also within the grounds. You can spend several hours here. #Mexicocity #museums #history