Here's a short tour of the Voynich manuscript. I find this thing fascinating. I think I linked to Web sites about it in my old diary. It's this manuscript (currently held at Yale's Beinecke Rare Books Library) which has hundreds of strange pictures and all annotated in a strange language. People have tried to crack it as a code, but it has been impervious. Anyway, read the site, it's a fascinating object.