Where was The Red Prince filmed?
1953 film
The Red Prince (1954) was filmed in Graz, Gmunden, Schönbrunn Palace, Bad Aussee and Schloss Ort, 5 places named in its Wikipedia article, in Austria. 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 5 places. Each links to the sentence that says so.
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Castles & palaces Schönbrunn Palace
Austria
Palace in Vienna, Austria
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Towns & cities
Graz
Austria
Capital of Styria, Austria
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Towns & cities Gmunden
Austria
Town in Gmunden District, Upper Austria, Austria
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Towns & cities Bad Aussee
Austria
Municipality in Liezen District, Styria, Austria
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Castles & palaces Schloss Ort
Austria
Château
Also shot in these places
Sissi – The Young EmpressHistorical film1956
North FaceAdventure film2008- Always Trouble with the TeachersComedy film1968