Where was Unconquered filmed?
1947 film by Cecil B. DeMille
Unconquered (1947) was filmed in Snake River, 1 place named in its Wikipedia article's Filming 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 Filming section
Wikipedia’s Filming section names 1 place. Each links to the sentence that says so.
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Landscapes & nature
Snake River
United States
Major tributary of the Columbia River in the northwestern United States
“Most of the filming was done on Hollywood sound stages, with some outdoor scenes filmed in western Pennsylvania and river scenes filmed on the Snake River in Idaho.” Wikipedia