Back in 2007 or so I was working at Microsoft on Bing Maps, and I decided to make an ajax map of Ultima 7 The Black Gate, and Serpent Isle. I used Exult to output the game's raw map imagery, chopped it into tiles, loaded them onto AWS, and made a website. It got noticed by a few enthusiast and even mapping sites, but after some hosting hiccups I took it down (and some people even noticed that).
All that's left online is a couple low-res images in a post about it.
At that time, Bing Maps had a 3D control (that I also wrote a lot of) called Virtual Earth 3D, so you could sort of fly around Britannia on a globe.