Eventually spanning from Libya and Macedonia in the West to the end of the Persian Gulf in the East, maps show the outlines of each empire. Cyrus the Great Page on the Persian king includes a map of his empire. Empire of Cyrus II 529 BC From Frank Smitha's site. Extending from the Aegean Sea to the Aral and South past Jerusalem. Interactive Map of Parthia Requires shockwave, but there's an alternative gif image.
Instructions are on the site for zooming in or out on the topographical map.
Iran of Achaemenids Large JPEG file showing the extent of the Persian Empire with cities. Another map showing the extent of the empire. This one shows mountain areas and rivers but without labels. Persia 500 B.C. Map from around 500 B.C. showing the expansion of the Persian Empire into territory inhabited by Greeks. Persian Empire Map of the Persian Empire from 530-323 B.C. when it was ruled by Achaeminid dynasty.