With that in mind, I present to you Secret and Complex Literatures.
What is it?
Secret and Complex Literatures, which needs a different name, by the way, is a fascinating site filled with ancient texts, strange invented languages/alphabets, obscure and relatively forgotten elements of ancient writing, and, of course, the Voynich Manuscript. If you're interested in invented languages by people other than Tolkien, particularly people you might not have known had invented languages, this is certainly a site for you.
Why is it cool?
Well, aside from the fact that it's a site that puts all this wonderful stuff right in front of your face, it includes a section of thirty-six beautiful manuscripts, a page of ambigrams, a page of calligraphies/micrographies/calligrams, six palimpsest manuscripts, twenty-three variations of secret writings and invented languages, and much more (Voynich, for example). It's all there. Fantasy fans will love this site, I imagine, because it puts all this wonderful stuff in one place; no need to Google search it (unless you want to know more about a particular item). The only downside is that much of the site is written in French, but that shouldn't deter you.
Give this site a look and let me know what you think!