Callao is built on and around a peninsula, the district of La Punta, a wealthy residential neighborhood. A historical fortress, the Castillo de Real Felipe, stands on the promontory overlooking the harbor. A large naval base is sited in Callao. Its prison holds Abimael Guzmán, the leader of the Shining Path terrorist organization, and Vladimiro Montesinos, the ex-director of internal security during the Fujimori regime. Jorge Chávez International Airport is located in Callao. On a bluff overlooking the harbor sits Colegio Militar Leoncio Prado, the military high school. The city also has a university, the National University of Callao. The main Naval Hospital, Centro Medico Naval is located on Avenida Venezuela in Bellavista. It contains the U.S. Navy command Naval Medical Research Unit Six. Residents of Callao are known as chalacos. Callao's professional football teams are Sport Boys and Atlético Chalaco Callao has several islands: San Lorenzo-currently a military base, El Frontón-a former high security prison, the Cavinzas Islands, and the Palomino Islands, where numerous sea lions and sea birds live in a virtually untouched ecosystem. There are proposed plans to build a huge naval, terrestrial, and air port on San Lorenzo Island. This project is called the San Lorenzo Megaport Project.