Here’s another list created for teens, but it is a nice place to start for anyone.
I used my own readings of books, and years of talking to teens and adults alike about the classics they’d read, whether assigned or not. It was always nice to have this handy when someone didn’t know where to start, or maybe they had a list, and if a book from the list was here, they’d try one of these first.
The Adventures of Merlyn Perilous 