C.U.is UNAM's main campus, located in Coyoacan borough in the southern part of Mexico City. Designed by architects Mario Pani and Enrique del Moral, it encloses the Olympic Stadium, about 40 faculties and institutes, the Cultural Center, an ecological reserve, the Central Library, and a few museums.At the time of its completion it was the largest single construction project in Mexico since the Aztecs.It was declared a World Heritage Site by UNESCO in 2007.