The Mount Wilson Observatory (MWO) is an astronomical observatory in Los Angeles County, California, United States. The MWO is located on Mount Wilson, a 5,715-foot (1,742 m) peak in the San Gabriel Mountains near Pasadena, northeast of Los Angeles. The observatory contains two historically important telescopes: the 60-inch (1.5 m) Hale telescope built in 1908 and the 100-inch (2.5 m) Hooker telescope, which was the largest telescope in the world from its completion in 1917 until the Hale telescope was built in 1948.
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But most people think of the LA Observatory as being the famous one in Griffith Park...a beautiful structure, but really better known or functions better as a planetarium.
