Alexander the Great (356-323 B.c.) -sits high above the juncture of two rivers, an ideal site for a military outpost. It is surrounded a mud-brick wall 33 feet high and 20 to 27 feet thick. The city's grand palace, a complex of monumental adminis- trative and residential buildings, covers more than 20 acres. There is nothing like it in Greece; the model for the plan was probably Persian, and the flat roofs are "characteristically Eastern." But columns in the classical styles-Doric, Ionic,...