Blue mosque, formerly known as Ahmed Mosque in Sudan, is one of the most famous mosques in Turkey. It was designed and built by Mehmet Aga, a proud student of Sinan, a famous classical architect in the Islamic world, in the early 17th century. Because the interior walls of the mosque are all decorated with blue and white Iznik tiles, it is one of the most important landmarks in Istanbul. Blue mosque is an Arab style dome building, surrounded by six minarets, symbolizing the six major beliefs of Islam. Blue mosque is one of the ten wonders of the world. Most of Istanbul's famous scenic spots are located near the Blue Mosque. There is a market in the square at night. Tourists are like knitting.