The Olympic University Stadium is a multi-purpose stadium belonging to the National Autonomous University of Mexico. It is Mexico's second biggest, after the Estadio Azteca, also in Mexico City, and can hold 68,954 spectators. It was the main site of the 1968 Olympic Games. Nowadays it is the home field to Universidad Nacional, a soccer team in Mexico's First Division, and of Pumas CU, an American college football team member in the ONEFA league. It was also the home stadium for the Mexican soccer team and for the América, Necaxa and Atlante teams from 1955 to 1966. It is the only Olympic stadium in the area declared a World Heritage Site (Ciudad Universitaria de la UNAM). Frank Lloyd Wright called it "the most important building in modern-day America".