The Alcazar of Chapultepec is nowadays a Museum in miniature; its purpose is to remember men and woman who lived in what was one of the residences of the rulers of Mexico. The Alcazar, situated to the east side of Chapultepec Castle, was closed to strangers’ eyes. Most Mexicans were unaware of it for almost two centuries. It could only be looked at from far away, as the jewel at the top of an old hill surrounded by a forest of Mexican cypresses. In 1939, President Lázaro Cárdenas received the proposal to convert the Alcazar into the National Museum of History. This museum was created along with the National Institute of Anthropology and History, and it reports to this huge and useful institution that keeps, researches, spreads information and protects the heritage from Mexico’s past. This building was adapted to the museographical needs, this is a permanent modernizing duty. In 1940, President Cárdenas declared that Chapultepec Castle “is opened to the people of Mexico”, to be a guardian and a window to the Mexican past. On September 27, 1944 it was opened as the National Museum of History, and the Alcazar became a site museum, a memory to its inhabitants. Nowadays, the Alcazar is an abbreviation of the many stories of dreams and achievements, of lost steps and determined decisions.