Nebuchadnezzar II completed the restoration of the Etemenanki ziggurat which was originally built around the time of Hammurabi (1792-1750 BCE). The Tower of Babel Stele, of which two of the original three parts are preserved in the Schøyen Collection (MS 2063), presents an image of the Etemenaki ziggurat contemporary with Nebachadnezzar's restoration, along with a simple building plan.
"The missing part of the stele's back, was in a religious institution in U.S.A., the present whereabouts unknown. The stele was found in a special hiding chamber, broken into 3 parts in antiquity, at Robert Koldewey's excavations of the site of the Tower of Babel in 1917. Its importance was immediately recognised. A photograph was taken with 3 archaeologists standing next to the stele. With the imminent danger of war breaking out in the area, they decided to rescue it, and each archaeologist carried one part out of the war zone. One part was taken to Germany, one part to Jordan and then London, the third part to U.S.A." (http://www.schoyencollection.com/babylonianhist.htm, accessed 02-19-2010).