The Hanging Gardens of Babylon are considered one of the seven ancient wonders of the world, the reason being its marvelous architecture and water engineering system for the irrigation of the Garden which was built in a way that it seemed to be hanging from the sky.
As to the question being why are the Hanging Gardens of Babylon important, is not even a valid question. The real mystery and the question are did the Gardens actually ever exist or not?
The Hanging Gardens of Babylon is assumed to be located 50 miles south of Baghdad near present Al Hillah, Babil in Iraq. There are many controversial theories related to the actual existence, construction and location of the gardens.
The most widely known and popular theory among all is that it was constructed King Nebuchadnezzar II of Babylon to please his homesick wife, Amytis. Amytis was from Media and missed the lush hills and valleys of her homeland Persia.
Some historians even give the credit of the beautiful gardens to the king Sennacherib and believe that the Hanging Gardens of Babylon was actually built 350 miles north of Babylon in the city of Nineveh.
The Hanging Gardens of Babylon are important due to the fact that its whole existence is in doubt. Another factor which contributes to the importance of these gardens is the mystery of how the garden was suspended in the air. Some historians say that the gardens were built in the tier like a theatre or balcony or terrace, while other came up with very different theories.
How the Hanging Gardens of Babylon received the water for irrigation from the nearby river "Euphrates" is still a big mystery. Some historians and scholars believed that the much-needed water was transported up the hill in trolleys like fashion with the help of two wheels, chain and a trolley.
Other scholars believe that a form of Archimedes Screw pushed up the water. Therefore, the Hanging Gardens of Babylon can be considered important from the archaeological point of view.