Mesopotamian cities are some of the oldest cities in the world, and two of the most famous are Babylon and Edessa. Babylon is a 7-letter city located in modern-day Iraq, and was an important cultural center in ancient Mesopotamia. It was the capital of the Neo-Babylonian Empire and is known for its hanging gardens, one of the Seven Wonders of the Ancient World. Edessa is a 6-letter city located in modern-day Turkey, and was an important trading center in the Middle Ages. It was the capital of the Kingdom of Osroene and is known for its many churches and monasteries.