Where was Om Shanti Om filmed?
2007 film directed by Farah Khan
Om Shanti Om (2007) was filmed in Film City, 1 place named in its Wikipedia article's Principal photography section, in India. 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 Principal photography section
Wikipedia’s Principal photography section names 1 place. Each links to the sentence that says so.
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Studios & sets
Film City
India
Film studio in Mumbai in Maharashtra, India
“Filming of the last sequence and the end-credit song was done in Film City.” Wikipedia