The Sultan Ahmed Mosque, also known as the Blue Mosque, is a historic mosque in Istanbul. The mosque is still religious today, and Muslim keep on kneeling on the red carpet after the call to prayer. Built under the rule of Ahmed I, the blue mosque got its name from the color of its wall that is blue. The particular design of this mosque is the result of two centuries of development of mosque architecture. With its five domes it is one of the most beautiful places in Istanbul.