Where was Riddle Gawne filmed?
1918 film by William S. Hart, Lambert Hillyer
Riddle Gawne (1918) was filmed in Chatsworth and Santa Monica Mountains, 2 places named in its Wikipedia article, 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 article
The Wikipedia article names 2 places. Each links to the sentence that says so.
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Landscapes & nature
Santa Monica Mountains
United States
Mountain range in Southern California, United States
“Parts of the film were shot on location in the Santa Monica Mountains and in Chatsworth, California, from June 14 to early July.” Wikipedia
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Towns & cities
Chatsworth
United States
City in Iowa, United States