Experts have pinned the location of the ancient Hanging Gardens of Babylon to about 50 kilometers (31 miles) southwest of what today is Baghdad, Iraq. It's even unknown what the gardens actually looked like. They could have been gardens hanging off a rooftop, wall or vaulted-ceiling, or something else entirely. Many historians speculate the gardens existed on ziggurats -- terrace-stepped pyramids [source: Encyclopedia Britannica].
The gardens were a geological anomaly. Water had to be siphoned off the Euphrates River and travel across the dry Mesopotamian land through channels dug specifically for that purpose. The water trickled down the gardens from above. The image of the oasis catapulted the gardens into one of the seven wonders of the ancient world.
Two different myths surround the building of the gardens. The first is attributed to Nebuchadnezzar, who supposedly wanted to make his wife happy; she had grown up near green mountains, and the gardens were a way of making her feel at home after moving to the desert.
The second story suggests Sennacherib built the gardens about 100 years after Nebuchadnezzar ruled, in order to imitate natural mountain greenery.
Nobody wonders about the origins of the Cliff House, our next pick; they just wonder why it has so many.