Phoenix's downtown area is called Copper Square, although most locals still call it Downtown. Incorporating the themes of Phoenix's early history with culture and local events, Copper Square is the name for the one square mile area surrounding Central Avenue and Jefferson. This is a slowly growing hotspot for activities and action. Downtown attractions include the Arizona Science Center, Phoenix Museum of History and the Phoenix Art Museum. Also downtown is the Burton Barr Central Library. Downtown Phoenix currently features about twenty-five mid-rise and high-rise buildings ranging up to 39 stories tall. Only two skyscrapers reach over 400 feet tall (122 m), the last of which was constructed in the 1970s.