El Periquillo Sarniento. One of the first books I read. I was a kid and it was kind of grotesque for my age, but it was a book schools gifted and it had drawings. I used to read a lot because I didn't have anything else to do and it sticked with me to this day, I have 3 versions of the same novel.

I'd recommend it if you want to learn about the life of México before it was México and if you want to learn more about the spanish language.