Heraklion is the largest city of Crete with a population close to 200,000. Heraklion houses the headquarters and the largest scientific organizations in Crete and is the commercial center of the island, with the largest port and airport. Worth seeing the giant Venetian walls (the largest in the Mediterranean) with various gates, the Archaeological Museum, the History Museum, the Museum of Natural History, the Museum of the Battle of Crete, the Aquarium. Also in the historical center, the Loggia, the square with the fountain of the Lions, the route on Aug. 25, the central market, the Basilica of San Marco, the churches of St. Titus, St. Menas, St. Catherine, St. Peter and Venetian harbor with its imposing fortress of Koules. In the evening you can stroll to the coastal avenue.