Chapultepec Castle is located on top of Chapultepec Hill. The name Chapultepec stems from the Nahuatl word chapoltepēc which means "at the grasshopper's hill". It is located in the middle of Chapultepec Park in Mexico City at a height of 2,325 meters (7,628 ft) above sea level. The site of the hill was a sacred place for Aztecs, and the buildings atop it have served several purposes during its history, including that of Military Academy, Imperial residence, Presidential home, observatory, and presently, the National Museum of History. It is the only royal castle in North America that was actually used as the residence of a sovereign: the Mexican Emperor Maximilian I, and his consort Empress Carlota, lived there during the Second Mexican Empire.