That would depend on your context.
In the Old Testament Babylon was the empire which overthrew the Nation of Judah. This was a punishment for Judah turning from God's commands and worshiping idols. You can search the name Babylon on BibleGateway.com or BlueLetterBible.com to find out more. Off the top of my head the nation of Babylon is a major character in the books of Jeremiah, Lamentations, the later parts of 2 Kings and 2 Chronicles, and the setting of the book of Daniel.
In the New Testament book of Revelation (a.k.a. Apocalypse of John) Babylon is used to symbolize a nation or power that opposes God's work.
In mesopotamia
Important center of Trade
In mesopotamia
Marduk.
The Hanging Gardens of Babylon played the role of making people visit Babylon. I don't think that it played a very important part in Babylon.
Babylon had a good water supply so is was rich in fruits and grains.
Babylon had plenty of water and plenty of fruits and vegetables and so it was an important trading post.
Babylon!
Babel (Babylon).
One of the most important cities of the mesopotamian civilizations was Ur which was present in the area since the Sumer empire.
Babylon had a good source of water so they had and grains and fruits to trade. This made it an important trading post.
Babylon's ruins are near the modern city of Al Hillah and about 55 miles south of Iraq's capital of Baghdad. Only fragments of some building foundations remain. Babylon became an important center for trade because it had good population. It was a well-known place for trade because it was the capitol of Mesopotamia. Everyone came to the place for trading.