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Cleveland/Observatory
The Palomar Observatory is an astronomical observatory located in the Cleveland National Forest on Palomar Mountain in San Diego County, California. It is owned and operated by the California Institute of Technology (Caltech). The observatory is home to the 200-inch (5.1 m) Hale Telescope, which was the world's largest telescope from 1949 until 1992, and the 48-inch (1.2 m) Samuel Oschin Telescope. The observatory also houses the Palomar Testbed Interferometer, a 30-meter (98 ft) radio telescope, and the Palomar Transient Factory, a robotic telescope dedicated to the study of transient astronomical events. The observatory is open to the public for tours and special events.