http://www.ncsa.uiuc.edu/SDG/Experimental/split/split1.html
This site contains an art historical presentation on the Palace of Diocletian at Split (ex-Yugoslavia), compiled by art historian Michael Greenhalgh. The essay contains several historical reconstructions of the Palace, with historical commentary, and a comparison with the Palatine Hill in Rome. There are also separate mosaic pages on diverse aspects of the palace site-- images of the colonnaded streets, a comparison with Split's architecture, the Emperor's apartments, the temple, the Emperor's mausoleum, the walls and gates, bibliography, and more.