Landmarks & buildings
Palomar Observatory
Observatory in Southern California
Wikipedia names Palomar Observatory as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Palomar Observatory. Each title’s page links to the sentence that says so.
Filming locations nearby
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Landscapes & nature
Palomar Mountain
United States · 3 km east
Mountain in San Diego County, California, USA
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Towns & cities
Valley Center
United States · 19 km south-west
Census-designated place in San Diego County, California, United States
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Landmarks & buildings
Callaway Vineyard & Winery
United States · 28 km north-west
Vineyard in California, USA
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Towns & cities
Temecula
United States · 29 km north-west
City in Riverside County, California, United States
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Towns & cities
Escondido
United States · 33 km south-west
City in San Diego County, United States
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Towns & cities
Fallbrook
United States · 35 km west
Census-designated place in San Diego County, California, United States