Nobody knows what any particular ziggurat looked like, or what features were common to them. It is mostly speculation. The article mentions the Hanging Gardens

Nobody knows what any particular ziggurat looked like, or what features were common to them. It is mostly speculation. The article mentions the Hanging Gardens of "Babylon", but no contemporary source mentions any such thing in any Babylon of history. The best evidence we do have suggests that classical mentions, which don't say where, describe what was found archaeologically in Nineveh, present day Mosul 400 mi north of the ancient site of Babylon. Nineveh, in the time of the Neo-assyrians, had what may have been the first aquaduct (centuries before any of Rome's) feeding water to their elevated gardens. The Neo-assyrians cultivated a reputation for genocide of defeated people, and public torture of their leaders.