The mosque is the House of prayer in Islam, one of the key elements of the religion. There are over 3,000 mosques in Istanbul of all sizes. Some of them are recent but there are many old ones built during the Ottoman period. For instance, the biggest mosque in the city is Süleymaniye Mosque from 16th century, and the most important one is Sultan Ahmet Mosque (known as Blue Mosque) from 17th century. Below you can find links to the major and most known old mosques in Istanbul, and more coming up soon.