That which is most likely required of a young man to be perceived as highly educated during the time period in which "The Adventure of the Mysterious Stranger" takes place is; He needs to travel in order to be exposed to art, music, and culture.
At the outset of the story, the narrator explained that he was sent on the grand tour to finish his education. He explained that this was the reason why nine-tenths of the youngsters were sent abroad.
It was believed that traveling abroad will help the young people to become exposed to other culture, music and art. This will be a good finishing for their education.
That was why the young man went to Venice.
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