Travelers are voting Griffith Observatory and Mount Wilson Observatory as the best observatories in Los Angeles. There are 4 observatories in Glendora a city just 31 km from Los Angeles and 2 observatories in Diamond Bar which is 32 km distant. The most popular of these are Griffith Observatory in Glendora and Mount Wilson Observatory in Diamond Bar. You can find 19 observatories in California and 231 observatories in the country of United States. Our members favorite in California is Robert Brownlee Observatory and Griffith Observatory is the top pick in United States. Want more? Check out our map of observatories in Los Angeles.