A reconstruction of the Adad Gate
Nineveh was an ancient Assyrian city on the eastern side of the Tigris River. It was the capital and a major city of the Assyrian empire. Its ruins are across the river from the modern-day city of Mosul, Iraq.
The ruins of Nineveh are surrounded by the remains of a massive stone and mudbrick wall dating from about 700 BC. The wall was bout 12 km in length. The stone retaining wall had projecting stone towers spaced about every 18 metres (59 ft). The stone wall and towers were topped by three-step parapets.