The Hanging Gardens of Babylon is considered to be among the Seven Wonders of the Ancient World. According to ancient accounts, the gardens were located in the city of Babylon (in present-day Iraq) and were built by King Nebuchadnezzar II in the 6th century BCE. The gardens were said to have been a marvel of engineering, with terraced gardens, exotic plants, and a complex system of irrigation to keep them watered. However, there is no definitive evidence for the existence of the gardens, and some historians believe that they may have been a myth or exaggeration.