Where was Gettysburg filmed?
1993 film by Ronald F. Maxwell
Gettysburg (1993) was filmed in Adams County and Little Round Top, 2 places named in its Wikipedia article's Production section, in the United States. 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 2 places. Each links to the sentence that says so.