Landmarks & buildings
Jongmyo
Royal Confucian shrine in Seoul, South Korea
Wikipedia names Jongmyo 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 Jongmyo. 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 Jongmyo. Each source is linked.
Filming locations nearby
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Castles & palaces
Changdeokgung
South Korea · under 1 km
Palace in Seoul, South Korea
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Landmarks & buildings Seoul Hyehwa Police Station
South Korea · under 1 km
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Castles & palaces Unhyeongung
South Korea · under 1 km
Palace of Joseon and Korean Empire
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Towns & cities
Insa-dong
South Korea · under 1 km
Neighborhood in Jongno-gu, Seoul, South Korea
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Streets & squares
Daehangno
South Korea · under 1 km
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Landmarks & buildings Seoul Jongno Police Station
South Korea · under 1 km