As one of the oldest cities in the country, Tucson is filled with historical architecture and culture that is displayed in over 30 regional museums. Tucson is rich in both the visual and performing arts, housing its own ballet company, professional theater, symphony and opera company. The city also encompasses 215 art groups and more than 35 art galleries. The University of Arizona and Davis-Monthan Air Force Base bring a surge of students to the city every year. The metropolitan area is home to over one million residents and continues to rapidly grow each month.