Castles & palaces
Hwaseong Fortress
Palace
Wikipedia names Hwaseong Fortress as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet. Newspapers, film offices and archives name more, listed below.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Hwaseong Fortress. Each title’s page links to the sentence that says so.
From published sources
Newspapers, film offices, archives and city filming permits say these were filmed at Hwaseong Fortress. Each source is linked.
Filming locations nearby
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Landscapes & nature
Paldal-san
South Korea · under 1 km
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Towns & cities Suwon
South Korea · under 1 km
Capital of Gyeonggi-do, South Korea
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Towns & cities
Paldal-gu
South Korea · under 1 km
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Landmarks & buildings
Maehyang Girls' Information High School
South Korea · under 1 km
High school in Suwon City, Gyeonggi Province, South Korea
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Towns & cities
Jeongja-dong
South Korea · 1 km west
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Landmarks & buildings
The Catholic University of Korea, St. Vincent's Hospital
South Korea · 2 km east
Hospital in South Korea