The tour and multi-layered model created by Aerilius is one of th best (both beautiful and most interesting... and functional) I have ever seen on Google Earth. It runs smoothly and includes attractive history "pop up bubbles" describing the building as it existed in stages over its 700 year history. If you like buildings and history, check it out.
Models like this could be used for a potential "3D historic buildings layer" on Google Earth which I mentioned in this post.
