The Arizona-Sonora Desert Museum is a 98-acre (40 ha) zoo, aquarium, botanical garden, natural history museum, publisher, and art gallery founded in 1952. Located just west of Tucson, Arizona, it features two miles (3.2 km) of walking paths traversing 21 acres (8.5 ha) of desert landscape. It is one of the most visited attractions in Southern Arizona. The nonprofit organization focuses on the interpretation of the natural history, plants and animals of the Sonoran Desert. The museum is home to more than 230 animal species and 1,200 varieties of plants.