The Palomar Observatory is a telescope site located in San Diego County, California. It is owned and operated by the California Institute of Technology and is one of the largest optical telescopes in the world. The observatory was built in the 1930s and has been used to observe galaxies, stars, and other celestial objects. It is also home to the famous 200-inch Hale Telescope, which was the largest telescope in the world when it was completed in 1948.