Why did nebuchadnezzar built the great ziggurat?

Nebuchadnezzar II built the Great Ziggurat, also known as the Etemenanki, in Babylon to honor the god Marduk, whom he revered as the city's patron deity. The ziggurat served both as a religious temple and a symbol of Babylon's power and cultural significance. It was intended to demonstrate Nebuchadnezzar's devotion to Marduk and to assert his authority as a ruler favored by the gods. Additionally, the ziggurat's towering structure exemplified the architectural and engineering advancements of the time.