Where was Trial filmed?
1955 film by Mark Robson
Trial (1955) was filmed in Shrine Auditorium and Expo Hall, 1 place 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 1 place. Each links to the sentence that says so.
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Landmarks & buildings
Shrine Auditorium and Expo Hall
United States
Large event venue in Los Angeles, California
“The scene depicting a rally in New York City was filmed over three days in Los Angeles's Shrine Auditorium and cost $110,000.” Wikipedia