Suleymaniye Mosque is located in Istanbul (formerly called Constantinople until the early 20th century), one of the most specific cities in the world, placed on two continents, with both European and Asia part facing the Bosphorus channel. As of March 2013, there were almost 83,000 mosques in Turkey, with more than 3,000 placed in the Istanbul area. Majority of them are from Ottoman period, subsequently Byzantine buildings (converted to mosques by the Ottomans) and post-Ottoman mosques built mostly in the 21st century. The Süleymaniye Mosque was commissioned by Suleiman the Magnificent in mid 16 century. Nowadays this mosque is the second largest mosque in the city and one of the best-known sights of Istanbul.