Something is always happening for the residents in Green Valley. The retirement community has more than 200 clubs offering everything from golf to bird-watching to mountain hiking. The town is home to the Titan II Missile Museum, the only one of its kind in the world offering a tour of the underground silo. Nearby attractions include the San Xavier del Bac Mission and the Tumacacori National Monument, built in the early 1700s. Green Valley's close proximity to metropolitan Tucson and the artist colony of Tubac offers endless options for participating in cultural and recreational events and for enjoying scenic attractions in the area. Kitt Peak National Observatory, a short distance to the southwest, features an 18-story observatory and the world's largest solar telescope.