Where was Quiz filmed?
British TV series
Quiz was filmed in Hammersmith and Southwark Crown Court, 2 places named in its Wikipedia article's Filming section, in the United Kingdom. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's Filming section
Wikipedia’s Filming section names 2 places. Each links to the sentence that says so.
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Towns & cities
Hammersmith
England
District in west London, England, United Kingdom
“Scenes were also filmed outside Southwark Crown Court and inside a former court building in Hammersmith.” Wikipedia
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Landmarks & buildings
Southwark Crown Court
England
Judicial building in South London, England