have showed signs that they were killed by blows to the head that could be from the spiked end of a copper axe, which showed Woolley's initial theory of mass suicide via poison to be incorrect. Inside Puabi's tomb there was a chest in the middle of the room. Underneath that chest was a hole in the ground that led to what was called the "King's Grave": PG-789. It was believed to be the king's grave because it was buried next to the queen. In this grave, there were 63 attendants who were all equipped with copper helmets and swords. It is thought to be his army buried with him. Another large room was uncovered, PG-1237, called the "Great death pit". This large room had 74 bodies, 68 of which were women. There were only two artifacts in the tomb, both of which were Lyres. Most of the treasures excavated at Ur are in the British Museum, the University of Pennsylvania Museum of Archaeology and Anthropology and the Baghdad Museum. At the Penn Museum the exhibition "Iraq's Ancient Past", which includes many of the most famous pieces from the Royal Tombs, opened to visitors in late Spring 2011. Previously, the Penn Museum had sent many of its best pieces from Ur on tour in an exhibition called "Treasures From the Royal Tombs of Ur." It traveled to eight American museums, including those in Cleveland, Washington and Dallas, ending the tour at the Detroit Institute of Art in May 2011. Samples from two stratigraphic layers in the royal cemetery area, from before the royal burials, have been radiocarbon dated. The ED Ia layer dated to c. 2900 BC and the ED Ic layer to c. 2679 BC. Archaeological remains Though some of the areas that were cleared during modern excavations have sanded over again, the Great Ziggurat is fully cleared and stands as the best-preserved and most visible landmark at the site. The famous Royal tombs, also called the Neo-Sumerian Mausolea, located about south-east of the Great Ziggurat in the corner of the wall that surrounds the city, are nearly totally cleared. Parts of the tomb area appear to be in need of structural consolidation or stabilization. There are cuneiform (Sumerian writing) on many walls, some entirely covered in script stamped into the mud-bricks. The text is sometimes difficult to read, but it covers most surfaces. Modern graffiti has also found