Not my usual area of interest, but I think this is really good (and a little hypnotic)...
There is a virtual tour of an Iron Age Gaulish village, Acy-Romance, now available online. You can get a general view of the village and go into more detail about daily life, sacred sites, and all sort of things. The level of detail is absolutely amazing:
Take the virtual tour
Although I would guess you need a decent internet connection, it takes a while to load (my internet connection's not fantastic, but it's not too shabby either). For a little background, try this article. It would be fantastic to see similar projects being done for Ireland and Scotland.