You guys used the wrong reference for that special Persian Gate :-/  The Ishtar Gate was built by Nebuchadnezzar II of the Neo-Babylonian Empire in 575BCE in Babylon. Persepolis, the actual Achaemenid Persian capital should be the primary source for such buildings, like the CC, which is excellent. I've seen other people criticise the Persians for looking too Babylonian before in youtube comments. The Gate of All Nations, built by Xerxes I between 486 and 465BCE at Persepolis would be a