Landmarks & buildings
Real Sanatorio de Guadarrama
Wikipedia names Real Sanatorio de Guadarrama 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 Real Sanatorio de Guadarrama. Each title’s page links to the sentence that says so.
Filming locations nearby
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Landscapes & nature La Barranca (valley)
Spain · 1 km east
Valley in Community of Madrid, Spain
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Towns & cities
Navacerrada
Spain · 3 km south
Municipality of Spain
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Landscapes & nature
Puerto de Navacerrada
Spain · 4 km north
Mountain pass
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Towns & cities
Mataelpino
Spain · 6 km east
Human settlement in El Boalo, Community of Madrid, Spain
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Towns & cities Moralzarzal
Spain · 9 km south
Municipality of Spain
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Towns & cities
Guadarrama
Spain · 11 km south-west
Municipality of Spain