Just about everything by Jules Verne would be spot on for a twelve year old and many of his books are available here. All are likely available at Gutenberg.
Then there's H. Rider Haggard's Allan Quartermain books (King Solomon's Mines, etc); I'd think those would be great for a young boy as well.
Alexandre Dumas' The Three Musketeeers (and more) may not have been written for twelve year olds, but they were my absolute favourite books at that age, along with One Thousand and One Nights.
Otherwise I second the previous recommendations of Edgar Rice Burroughs, H. G. Wells and Mary Shelley: all great books and all eminently suitable I would think.
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