The term 'Hanging Garden City' is a reference to the ancient city of Babylon, which was located in modern-day Iraq. It was renowned for its impressive architecture, including the Hanging Gardens of Babylon, one of the Seven Wonders of the Ancient World. The gardens were built by King Nebuchadnezzar II around 600 BCE and were an engineering marvel, featuring lush vegetation and terraces that were irrigated by a complex system of pumps and aqueducts.