Mount Wilson Observatory is another Los Angeles-based observatory, located on the summit of Mount Wilson outside of Pasadena. Boasting an incredible dome which can be seen from all over the city, the Mount Wilson Observatory houses the Hooker 100-inch telescope which can be viewed free of charge from the Visitors’ Gallery. Two hour tours are also available for people interested in actually standing on the telescope floor directly below the 100-inch beast, bringing you even closer to the science and research.