University of Texas at Austin
University of Texas: Persian Empire About 500 Bc
Follow the Royal Highway of Darius I on this old map of the Persian Empire from University of Texas. The borders of the satrapies are shown also.
Internet History Sourcebooks Project
Fordham University: Ancient History Sourcebook: The Worship of Cybele
This site from Fordham University contains a description of the Cult of Cybele by the Epicurean poet Lucretius.