Alexandria is the second largest city in Egypt, the largest lying directly on the Mediterranean coast and Egypt´s largest seaport. It is also an important tourist resort. Hellenistic Alexandria was best known for the Lighthouse (Pharos), one of the Seven Wonders of Ancient World; its Great Library (the largest in the ancient world now replaced by a modern one); and the Necropolis, one of the Seven Wonders of the Middle Ages. Alexandria became a major center of the international shipping industry and one of the most important trading centers in the world, both because it profited from the easy overland connection between the Mediterranean Sea and the Red Sea, and the lucrative trade in Egyptian cotton.