Just off the Zócalo are the Palacio Nacional, the Cathedral Metropolitana, the Templo Mayor with its adjoining museum, and Nacional Monte de Piedad building. The Palacio Nacional borders the entire east side of the Zocalo and contains the offices of the President of Mexico, the Federal Treasury, the National Archives as well as murals depicting pre-Hispanic life and a large mural filling the central stairway depicting the entire history of the Mexican nation from the Conquest on. This palace was built on the ruins of Moctezuma II's palace beginning in 1521, using the same tezontle stone used to build the Aztec palace. It was originally in the Hernán Cortés family until the king of Spain bought it to house the viceroys of New Spain and remained so (despite being destroyed and rebuilt again in 1692) until Mexican independence. Facing the Zócalo above a central balcony is the Campana (Bell) of Dolores, which is rung by the president each 15th of Sept to celebrate Independence.