Thank you to Steven Till for blogging about this. The Digital Atlas of Medieval and Roman Civilisations is an interactive map created by Harvard to create a Google style historical map. I must say this is an exciting project, and although they have released it as a beta, I did feel slightly disappointed that there wasn’t more. I would have expected all the major Medieval kingdoms to be mapped out, but that’s not the case. Hopefully more will be added soon though.
Here’s a screenshot to wet your appetite (click on it to expand!):