Anyone know what this is?
It's in the location of where the tower of Babel would have been located.
This temple is square, and each side is two stadia in length. In the centre is a massive tower, of one stadium in length and breadth; on this tower stands another tower, and another again upon this, and so on up to eight.
— Herodotus (I, 178-182)[3]
Data from the Esagila tablet,[4] which was copied from older texts in 229 BC and describes Esagila in lines 1–15 before passing on to the ziggurat of Etemenanki, have aided in the temple's reconstruction. The tablet, described by George Smith in 1872, disappeared for some time into private hands before it resurfaced and began to be interpreted.[5]
The Esagila tablet hold Babylonian calculating methods considered to be sacred as they read in the back "let the initiate show the initiate, the non-initiate must not see this". On the front, the tablet explains the history and engineering of the 7-floor high Etemenanki temple (often thought to have inspired the Tower of Babel in the Bible).[3]
It lay south of the ziggurat Etemenanki
there was also a little lake which was named Abzu by the Babylonian priests