The Hanging Gardens of Babylon were one of the Seven Wonders of the Ancient World, built by Nebuchadnezzar II around 600 BC. They were described as a remarkable feat of engineering with an ascending series of tiered gardens, irrigated by an exceptional system of irrigation. However, to date, no archaeological evidence has been found at Babylon for the Hanging Gardens. It is possible that evidence exists beneath the Euphrates, which cannot be excavated safely at present. Some scholars claim that the gardens were not in Babylon but actually at Nineveh, capital of the Assyrian Empire, while others stick with the ancient writers and await archaeology to provide positive proof. Others believe the gardens are merely a figment of the ancient imagination. Although the location of the Hanging Gardens remains elusive, they are still considered one of the most captivating of all the Seven Wonders.