Text in Russian. Daniel Waugh has developed a rather extensive collection of materials on Novgorod , including several extensive sets of images with at least some analytical discussion. The pages cover archaeological material, public monuments, church architecture and painting. One page is devoted to bibliography and links. Among the regions of Eastern Europe of interest to us, the Crimea is well represented on the web.
Some pages have quite a lot of information on historic sites such as Genoese forts.
Although it claims to present what they all looked like ca. 1200 CE, one might take that assertion with a grain of salt. There is a good introduction to Mt. Athos , with high-quality pictures of the monasteries and selected icons from their collections. Note, as of this posting, the initial image map is not functioning, but one can access the individual monasteries' pages from the listing below it. It has a section on icons , another on eighteenth century Russian painting , and others for later periods.