Palomar Observatory
Observatory · Palomar Mountain, California
Caltech's observatory on Palomar Mountain in San Diego County, built around the 200-inch Hale Telescope — which took twenty years to complete, held the record as the largest effective telescope in the world for forty-five years, and is still working every clear night. The dome that houses it is the size of the Pantheon.
35899 Canfield Road, Palomar Mountain, California, 92060, United States
Generally open daily 09:00 to 15:00, weather permitting. Guided tours at weekends in season. No public night observing.
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