The film is the result of more than 20 years' research by Dalley, of Oxford's Oriental Institute, to prove the gardens' location. With no archaeological evidence ever found, many dismissed them as a myth. Knowledge of the gardens is based on a few accounts, written hundreds of years after they were said to have been built and by people who never saw them.
One account claims they were created by King Nebuchadnezzar, 600 years before the birth of Christ, at Babylon, as a paradise in the desert for his wife who missed the green mountains of her home. However, in the writings of the time, including Nebuchadnezzar's own texts, there is no mention of a garden and more than a century of digging has found nothing.
Dalley directed her own research north after decoding an ancient cuneiform text - the wedge-shaped script of the Babylonian and Assyrian Empires - that led her to believe the gardens had been attributed to the wrong location, the wrong man and wrong period.
The academic, one of a handful of people in the world who can read cuneiform, found a reference to the gardens on the Taylor Prism at the British Museum. It describes the life of Sennacherib, who lived 100 years before Nebuchadnezzar and ruled an empire stretching from southern Turkey to modern-day Israel. It also describes a palace and gardens the king built as a "wonder for all people".
Further support for the theory comes from a bas-relief from Nineveh, now in the British Museum, which shows his palace complex and a garden featuring trees on terraces and plants hanging from arches.
Because Nineveh is so far from Babylon, the evidence was overlooked. However, Dalley found that the Assyrians later conquered Babylon and their capital became known as "New Babylon", possibly accounting for the confusion over the names.
The ancient wonders
* Great Pyramid of Giza, Egypt
* Temple of Artemis at Ephesus, Turkey
* Statue of Zeus at Olympia, Greece
* Mausoleum at Helicarnassus, Turkey
* Colossus of Rhodes, Greece
* Lighthouse of Alexandria, Egypt
* Hanging Gardens of Babylon, Iraq.