Built: About 600 B.C.

Location: In Babylon near modern-day Baghdad, Iraq

History: These gardens -- which may be only a fable -- are said to have been laid out on a brick terrace by King Nebuchadnezzar II for one of his wives. According to the writings of a Babylonian priest, they were approximately 400 feet square and 75 feet above the ground. His account says slaves working in shifts turned screws to lift water from the nearby Euphrates River to irrigate the trees, shrubs and flowers.