Where was Walking the Streets of Moscow filmed?
1964 film by Georgiy Daneliya
Walking the Streets of Moscow (1964) was filmed in Universitet and Triumfalnaya Square, 2 places named in its Wikipedia article, 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 Wikipedia's article
The Wikipedia article names 2 places. Each links to the sentence that says so.

