St Paul's Cathedral, London is significant to the film Sherlock Holmes because it is a important filming location where arguably the main climax of the movie happens. I found this information from a walking tour blog that talks about the effects London had on the film and how the Cathedral was inspiring. This source is a example of singular authorship because the blog was made by one author Alex Werner who talks about the movie and London's locations. Mapping this location on COVE adds a grassroot layer to the story of the overall theme or setting that the producer was going for. This is super important because the setting helped give the idea that the film was based in the late 1800s.
https://www.londonmuseum.org.uk/blog/sherlock-holmes-london-behind-stories/
https://bakerstreet.fandom.com/wiki/St_Paul%27s_Cathedral