Where was Bol Bachchan filmed?
2012 film by Rohit Shetty
Bol Bachchan (2012) was filmed in Panchgani, 1 place named in its Wikipedia article's Production 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 Production section
Wikipedia’s Production section names 1 place. Each links to the sentence that says so.
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Towns & cities
Panchgani
India
Hill station in Maharashtra, India
“The film has been shot at various locations, including Shetty's seemingly favourite Panchgani environs, as well as Chomu Palace, among other locations.” Wikipedia