Where was The Little Drummer Girl filmed?
2018 British television miniseries
The Little Drummer Girl (2018–) was filmed in Acropolis of Athens and Barbican Centre, 2 places named in its German Wikipedia’s Produktion section, in the United Kingdom, Greece. 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 German Wikipedia's Produktion section
German Wikipedia’s Produktion section names 2 places. Each links to the sentence that says so.

