Where was It Happened in Penkovo filmed?
1958 film by Stanislav Rostotsky
It Happened in Penkovo (1958) was filmed in Кленково, 1 place named in its Russian Wikipedia’s Съёмки section, in Russia. 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 Russian Wikipedia's Съёмки section
Russian Wikipedia’s Съёмки section names 1 place. Each links to the sentence that says so.