The permanent collection contains about 1,300 pieces, the second largest in Mexico after Rafael Coronel Museum in Zacatecas city, and is almost entirely made of Mexican masks and dance costumes.The building is a former mansion, located alongside the Plaza del Carmen in the historic center of San Luis Potosí.[1] In the 1890s, Ramón Martí purchased five adjoining homes and demolished them to build his residence in Neo Classical style, designed by engineer Enrique Campos.[5] The building is classified by the Instituto Nacional de Antropología e Historia (National Institute of Anthropology and History) as a historic monument.[6] The initial collection was a donation made by anthropologist and researcher Victor Jose Moya Rubio and Mildred Dingleberry Himm, his lifelong loving wife.