empire, Tenochtitlan (modern-day Mexico City), some of which may still be seen. On observing the great city Hernán Cortés wrote, "There are, in all districts of this great city, many temples or palaces,... They are all very beautiful buildings. Amongst these temples there is one, the principal one, whose great size and magnificence no human tongue could describe,... All round inside this wall there are very elegant quarters with very large rooms and corridors. There are as many as forty towers, all of which are so high that in the case of the largest there are fifty steps leading up to the main part of it and the most important of these towers is higher than that of the cathedral of Seville..." In the Yucatan, a well-preserved Mayan palace with a unique four storey observation tower stands at the Palenque site, from where Pakal reigned over the city-state. The National Palace, or Palacio Nacional, located in Mexico City's main square, the Plaza de la Constitución (El Zócalo), first built in 1563, is in the heart of the Mexican capital. In 1821, the palace was given its current name and the executive, legislative, and judicial branches of government were housed in the palace; the latter two branches would eventually reside elsewhere. During the Second Mexican Empire, its name was changed, for a time, to the Imperial Palace. The National Palace continues to be the official seat of the executive authority, though it is no longer the official residence of the President. Also in Mexico City is the Castillo de Chapultepec, or Chapultepec Castle, located in the middle of Chapultepec Park which currently houses the Mexican National Museum of History. It is the only castle, or palace, in North America that was occupied by sovereigns – Emperor Maximilian I of Mexico, a member of the House of Habsburg and his consort, Empress Carlota of Mexico, daughter of Leopold I of Belgium. The palace features many objets d'art ranging from gifts of Napoleon III to paintings by Franz Xaver Winterhalter and Mexican painter Santiago Rebull. United States Palaces in the United States include the White House, the official residence of the President, and the official residences of many governors and Roman Catholic bishops. Some palaces of former heads of state or their representatives, such English and Spanish Royal Governors and the Hawaiian Royal Family still exist. Examples include: ʻIolani Palace and Hānaiakamalama, the