"A look into the future that never was" "The Paleo-Future blog was started by Matt Novak in January of 2007. Matt has since become an accidental expert on past visions of the future, and has amassed the world's largest (only?) library of media related to the study of paleo-futurism. " Books, articles, images up to the 1800s
My all-time favourite site/protoblog, closed in 2007. Still the archives are online. Two main parts: Isaac D’Israeli’s Curiosities of Literature - a very large work brought here online; and more especially, a gigantic database of strange (mostly fairly ancient) art and engravings. Mr. h. used to give away some of his books through this site. This is the top in what me might call scientific study of visionary art with lots of images and lots of external links.
Online version of the British Library. Lots of illustrated books as well, in flash format.