Where was A Bomb Was Stolen filmed?
1962 film by Ion Popescu-Gopo
A Bomb Was Stolen (1961) was filmed in Alexandria, Buftea and Zilișteanca, 3 places named in its Romanian Wikipedia’s Producție section, in Romania. 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 Romanian Wikipedia's Producție section
Romanian Wikipedia’s Producție section names 3 places. Each links to the sentence that says so.

