The Museo Nacional de Antropologia (MNA, or National Museum of Anthropology) is a national museum of Mexico. It is the most visited museum in Mexico. Located in the area between Paseo de la Reforma and Calle Mahatma Gandhi within Chapultepec Park in Mexico City, the museum contains significant archaeological and anthropological artifacts from the pre-Columbian heritage of Mexico, such as the Piedra del Sol (the "Stone of the Sun" or Aztec calendar stone) and the 16th-century Aztec statue of Xochipilli. Designed in 1964 by Pedro Ramirez Vazquez, Jorge Campuzano and Rafael Mijares, it has an impressive architecture with exhibition halls surrounding a patio with a huge pond and a vast square concrete umbrella supported by a single slender pillar (known as "el paraguas", Spanish for "the umbrella") around which splashes an artificial cascade. The halls are ringed by gardens, many of which contain outdoor exhibits. The museum has 23 rooms for exhibits and covers an area of 79,700 square meters (almost 8 hectares) or 857,890 square feet (almost 20 acres).