English: University of the Philippines Diliman[1]The U.P. Diliman campus is connected to Commonwealth Avenue via the University Avenue. It stretches 800 meters where traffic enters the campus, or proceeds towards C.P. Garcia St., which connects Commonwealth Avenue to Katipunan Avenue. At the end of University Avenue, the Oblation Plaza of the Diliman campus faces the road. Behind it, the facade of Quezon Hall can be seen. The Gen. Antonio Luna Parade Grounds, or commonly known as the Sunken Garden, is a 5-hectare natural depression found on the eastern side of the campus and at the end of the Academic Oval circle. Sunken Garden is enclosed by the U.P. Diliman Main Library (also houses the School of Library and Information Studies), College of Social Sciences and Philosophy's Department of Psychology, College of Education, Student Activity Center/Vinzons Hall, College of Business Administration, School of Economics and College of Law. The Grounds was originally a property of the UP Reserved Officers' Training Corps when the campus was founded in 1949.