THE WEB PAGE OF THE JEWISH NATIONAL AND UNIVERSITY LIBRARY has an online searchable catalogue and displays of "ancient" (i.e., medieval to modern) maps of Jerusalem, a collection of ketubbot (marriage contracts) going back to the eleventh century, and an "Online Treasury of Talmudic Manuscripts." I can't get the last item to work. Your browser needs to be configured to handle Hebrew fonts, but mine is and that's not the problem.