Etemenanki (Sumerian É.TEMEN.AN.KI 𒂍𒋼𒀭𒆠 "temple of the foundation of heaven and earth") was the name of a ziggurat dedicated to Marduk in the city of Babylon of the 6th century BCE Neo-Babylonian dynasty. Originally seven stories in height, little remains of it now except ruins.
It is unclear exactly when Etemenanki was first built. A review article by Andrew R. George says that its builder may have "reigned in the fourteenth, twelfth, eleventh or ninth century" but argues that
The reference to a ziqqurrat at Babylon in the Creation Epic (Enûma Eliš· VI 63: George 1992: 301-2) is more solid evidence, however, for a Middle Assyrian piece of this poem survives to prove the long-held theory that it existed already in the second millennium BC. There is no reason to doubt that this ziqqurrat, described as ziqqurrat apsî elite, ‘the upper ziqqurrat of the Apsû’, was E-temenanki.
The city of Babylon had been destroyed in 689 BCE by Sennacherib, who claims to have destroyed the Etemenanki. The city was restored by Nabopolassar and his son Nebuchadnezzar II. It took 88 years to rebuild the city; its central feature was the temple of Marduk (Esagila), with which the Etemenanki ziggurat was associated. The ziggurat was rebuilt by Nebuchadnezzar II. The seven stories of the ziggurat reached a height of 91 meters, according to a tablet from Uruk (see below), and contained a temple shrine at the top.
In Nebuchadnezzar's own words:
The tower, the eternal house, which I founded and built. I have completed its magnificence with silver, gold, other metals, stone, enameled bricks, fir and pine. The first which is the house of the earth’s base, the most ancient monument of Babylon; I built and finished it. I have highly exalted its head with bricks covered with copper. We say for the other, that is, this edifice, the house of the seven lights of the earth the most ancient monument of Borsippa. A former king built it, (they reckon 42 ages) but he did not complete its head. Since a remote time, people had abandoned it, without order expressing their words. Since that time the earthquake and the thunder had dispersed the sun-dried clay. The bricks of the casing had been split, and the earth of the interior had been scattered in heaps. Merodach, the great god, excited my mind to repair this building. I did not change the site nor did I take away the foundation. In a fortunate month, in an auspicious day, I undertook to build porticoes around the crude brick masses, and the casing of burnt bricks. I adapted the ciruits, I put the inscription of my name in the Kitir of the portico. I set my hand to finish it. And to exalt its head. As it had been done in ancient days, so I exalted its summit.
A Neo-Babylonian royal inscription of Nebuchadnezzar II on a stele from Babylon, claimed to have been found in the 1917 excavation by Robert Koldewey, and of uncertain authenticity, reads: "Etemenanki Zikkurat Babibli [Ziggurat of Babylon] I made it, the wonder of the people of the world, I raised its top to heaven, made doors for the gates, and I covered it with bitumen and bricks." The Etemenanki is depicted in shallow relief, showing its high first stages with paired flights of steps, five further stepped stages and the temple that surmounted the structure. A floor plan is also shown, depicting the buttressed outer walls and the inner chambers surrounding the central cella.
Scholars have recently discovered in the Schoyen Collection the oldest known representation of the Tower of Babel. Carved on a black stone, The Tower of Babel Stele (as it is known) dates from 604-562 BC, the time of Nebuchadnezzar II.
The Etemenanki is described in a cuneiform tablet from Uruk from 229 BCE, a copy of an older text (now in the Louvre in Paris). It gives the height of the tower as seven stocks (91 meters) with a square base of 91 meters on each side. This mud brick structure was confirmed by excavations conducted by Robert Koldewey after 1913. Large stairs were discovered at the south side of the building, where a triple gate connected it with the Esagila. A larger gate to the east connected the Etemenanki with the sacred procession road (now reconstructed in the Pergamon Museum in Berlin).
Babylon's outer wall is the main defence of the city. There is, however, a second inner wall, of less thickness than the first, but very little inferior to it in strength. The center of each division of the town was occupied by a fortress. In the one stood the palace of the kings, surrounded by a wall of great strength and size: in the other was the sacred precinct of Jupiter [Zeus] Belus, a square enclosure two furlongs [402 m] each way, with gates of solid brass; which was also remaining in my time. In the middle of the precinct there was a tower of solid masonry, a furlong [201 m] in length and breadth, upon which was raised a second tower, and on that a third, and so on up to eight. The ascent to the top is on the outside, by a path which winds round all the towers. When one is about half-way up, one finds a resting-place and seats, where persons can sit for some time on their way to the summit. On the topmost tower there is a spacious temple, and inside the temple stands a couch of unusual size, richly adorned, with a golden table by its side. There is no statue of any kind set up in the place, nor is the chamber occupied of nights by any one but a single native woman, who, as the Chaldeans, the priests of this god, affirm, is chosen for himself by the deity out of all the women of the land.
Final demolition 
In 331 BCE, Alexander the Great captured Babylon and ordered repairs to the Etemenanki; when he returned to the ancient city in 323 BCE, he noted that no progress had been made, and ordered his army to demolish the entire building, to prepare a final rebuilding. His death, however, prevented the reconstruction. The Babylonian Chronicles and Astronomical Diaries record several attempts to rebuild the Etemenanki, which were always preceded by removing the last debris of the original ziggurat. The Ruin of Esagila Chronicle mentions that the Seleucid crown prince Antiochus I decided to finally rebuild it, sacrificed, stumbled and fell, and angrily ordered his elephant drivers to destroy the last remains. There are no later references to the Etemenanki from antiquity.
- George , Andrew (2007) "The Tower of Babel: Archaeology, history and cuneiform texts" Archiv fuer Orientforschung, 51 (2005/2006). pp. 75-95. pdf document.
- Mc Clintock, Strong (1894). Mc Clintock and Strong cyclopaedia By John McClintock, James Strong. pp. 465–469.
- Koldewey had identified Etemenanki in November 1900; the vicissitudes of the archaeological enterprise, in which the enormous mass of debris covering it was shoveled away and shafts and tunnels pierced, were summarised in Friedrich Wetzel and F. H. Weissbach, Das Hauptheiligtum des Marduk in Babylon, Esagila und Etemenanki (Leipzig) 1938; the most recent monograph is HansJörg Schmid, Der Tempelturm Etemenanki in Babylon (Mainz) 1995.
- The house, the foundation of heaven and earth". The stele was broken in Antiquity in three pieces, two of which are reunited in the Schøyen collection, MS 2063
- "Ancient Texts Part of Earliest Known Documents". news.discovery.com. Retrieved 2011-12-28.
- "Babylonian History". http://www.schoyencollection.com. Retrieved 2011-12-28.
- Herodotus, Histories 1.181
- Harris, Stephen L. (2002). Understanding the Bible. McGraw-Hill. pp. 50–51. ISBN 9780767429160.
- Streck, Michael P. (2006). "Die Stadt, an deren Freuden man nicht satt wird". Damals (in German). Special volume: 11–28.
- Diodorus Siculus, 2.9.9; Strabo, Geography, 16.1.5.
- R.J. van der Spek, "Darius III, Alexander the Great and Babylonian scholarship" in: Achaemenid History XIII (Leiden 2003), 289-346.
- A.R. George, "E-sangil and E-temen-anki, the Archetypal Cult-centre?" in: J. Renger, Babylon: Focus mesopotamischer Geschichte, Wiege früher Gelehrsamkeit, Mythos in der Moderne (1999 Saarbrücken)
- Hansjörg Schmid, Der Tempelturm Etemenanki in Babylon (1995 Mainz)
- The Tower of Babel Stele, Schoyen Collection
- Etemenanki (The tower of Babel) by Jona Lendering