Paganini’s 24th caprice is brilliant. He wrote it just to show off his skill. I will check if there’s one on youtube.
I saw the young violinist James Ehnes play that caprice in the living room of a home in Seattle as part of a fundraiser. I’ve never witnessed anything like it since.
Brilliant enough for both Brahms and Rachmaninoff to base large-scale works of their own on it.