The Castle of Chapultepec in Mexico City. Construction started in 1785 on top of what was a sacred hill of the Aztecs called Chapultepec, which is Nahuatl, language of the Aztecs meaning "Hill of the grasshoppers", by the Viceroy of New Spain, Bernado De Galvez, and after Mexican Independence in 1821, it was used as a presidential palace, military academy, the palace of Emperor of Mexico Maximillian I when the French occupied Mexico from 1862 to 1867, and in 1939 it became a museum. It is now part of Chapultepec Park and there is a popular Mexican song about it, " Las Rejas de Chapultepec" or in English, the gates of Chapultepec, and if you've ever heard of the US Marine Corps hymn, "From the Halls of Montezuma to the shores of Tripoli", during the Mexican-American war, the US Marines assaulted and occupied the castle which was defended by Mexican cadets which, because they were shooting at the Marines, they got killed even though they were boys, and there is a monument in site called "Los Ninos heroes".