Jeremiah 51:53

Mount up to heaven. The reference is possibly to the exceedingly high walls of Babylon and to the great temple-tower that stood in the center of the city. Because only broken foundations remain today, it is impossible to calculate the height of the walls of Babylon as they stood at the zenith of its glory. Herodotus (i. 178) states that the city wall was 200 royal cubits (about 340 ft.) high. Although this is undoubtedly exaggeration (see Additional Note on Dan. 4), it does indicate that the wall must have reached an unusual height. The ziggurat, or temple tower of Babylon, according to a contemporary cuneiform inscription, rose some 300 ft. in the air.