The National Autonomous University of Mexico (Spanish: Universidad Nacional Autónoma de México, UNAM) is a public research university in Mexico. It ranks highly in world rankings based on the university's extensive research and innovation. It is the largest university in Latin America and has one of the biggest campuses in the world. UNAM's main campus in Mexico City, known as Ciudad Universitaria (University City), is a UNESCO World Heritage site that was designed by some of Mexico's best-known architects of the 20th century and hosted the 1968 Summer Olympic Games. Murals in the main campus were painted by some of the most recognized artists in Mexican history, such as Diego Rivera and David Alfaro Siqueiros. With acceptance rates usually below 10%, UNAM is also known for its competitive admission process. UNAM generates a number of strong research publications and patents in diverse areas, such as robotics, computer science, mathematics, physics, history, philosophy, among others. All Mexican Nobel laureates are either alumni or faculty of UNAM.