The Basilica of Hagia Sophia (Holy Wisdom), now called the Ayasofya Museum, is unquestionably one of the finest buildings of all time. Built by Constantine the Great and reconstructed by Justinian in the 6th century, its immense dome rises 55 meters above the ground and its diameter spans 31 meters. Linger here to admire the building's majestic serenity as well as the fine Byzantine mosaics. (Open every day except Monday). The Archeological Mu...