17. Sultan Ahmed Masjid, Istanbul

The Sultan Ahmed Masjid is a historical Masjid in Istanbul, the largest city in Turkey and the capital of the Ottoman Empire (from 1453 to 1923). The Masjid is popularly known as the Blue Masjid for the blue tiles adorning the walls of its interior. It was built between 1609 and 1616, during the rule of Ahmed I. Like many other Masjids, it also comprises a tomb of the founder, a madrasah and a hospice. While still used as a Masjid, the Sultan Ahmed Masjid has also become a popular tourist attraction. Sultan Ahmed Masjid is known as seventeenth largest Masjid in the world.