The Hanging Gardens of Babylon, one of the Seven Wonders of the Ancient World, weren’t in Babylon at all – but were instead located 300 miles to the north in Babylon’s greatest rival Nineveh, according to a leading Oxford-based historian.

After more than 20 years of research, Dr. Stephanie Dalley, of Oxford University’s Oriental Institute, has finally pieced together enough evidence to prove beyond reasonable doubt that the famed gardens were built in Nineveh by the great Assyrian ruler Sennacherib – and not, as historians have always thought, by King Nebuchadnezzar of Babylon.

Dr. Dalley first publicly proposed her idea that Nineveh, not Babylon, was the site of the gardens back in 1992, when her claim was reported in The Independent – but it’s taken a further two decades to find enough evidence to prove it.

Detective work by Dr. Dalley – due to be published as a book by Oxford University Press later this month – has yielded four key pieces of evidence.

First, after studying later historical descriptions of the Hanging Gardens, she realized that a bas-relief from Sennacherib’s palace in Nineveh actually portrayed trees growing on a roofed colonnade exactly as described in classical accounts […]