The Hanging Gardens of Babylon are thought to have been built in the ancient city of Babylon. Even though there is no proof that they actually existed, they are considered to be one of the Seven Wonders of the World. It is called the Hanging Gardens because the gardens were built high above the ground on multi-level stone terraces. The plants weren't rooted in the earth like a traditional garden.

1- The Hanging Gardens are the only one of the Seven Wonders of the ancient world that may not even have existed.

2- There is no documentation in Babylonian sources that the gardens ever existed. There is also no solid archaeological evidence that they existed.

3- The most popular theory is that the gardens were built by king Nebuchadnezzar II to make his wife happy. She was homesick for the plants and gardens of her homeland.

4- King Nebuchadnezzar II ruled Babylon from 605BC, for a period of 43 years. It was during this time that he is said to have had the Hanging Gardens built.

5- If the gardens actually existed, it would have taken 8,200 gallons of water each day to keep the plants watered.

6- The gardens were thought to be about 75 feet high. The water would have had to have been carried up or transported to the top of the gardens by a primitive water irrigation system.

7- Some historians and archaeologists believe that the gardens did exist and were destroyed by war and erosion. Some believe it was earthquakes that eventually devastated and destroyed the gardens.

8- Several ancient Roman and Greek writers wrote about the gardens. They wrote about why they were built, how they were built, and the size of the gardens. They even described how the gardens were watered. They didn't all agree on why they were built or who they were built for.