Where was The Tavern on Pyatnitskaya filmed?
1978 film by Aleksandr Faintsimmer
The Tavern on Pyatnitskaya (1978) was filmed in Bolshaya Ordynka Street and Nikolayevsky Chernoostrovsky monastery, 2 places 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 2 places. Each links to the sentence that says so.

