The great ziggurat of Babylon was a stepped pyramid 91 metres on each side and originally about the same height, dedicated to the city's chief god Marduk. It stood next to the Esagila temple complex and dominated the skyline of the ancient city.
What remains today is a rectangular depression filled with groundwater, surrounded by low mounds of rubble — the ziggurat itself was systematically demolished by successive rulers who reused its bricks for their own buildings, and the site has been water-logged for centuries. The outline is still legible on the ground and from the air, and walking the perimeter is one of the more affecting moments on a Babylon visit.