Bandelier National Monument is a 33,677-acre (13,629 ha) National Monument preserving the homes of the Ancestral Pueblo People. It is named after Swiss anthropologist Adolph Bandelier, who researched the cultures of the area. Bandelier was designated a National Monument on February 11, 1916. The National Park Service co-operates with surrounding pueblos, other federal agencies and state agencies to manage the park. The monument received 193,914 visitors in 2011.