The document summarizes key architectural features of mosques. Mosques typically include a large central prayer hall where worshippers pray on the floor. An open courtyard called a sahn surrounds the prayer hall and often includes a fountain for ablutions. A mihrab niche in the qibla wall indicates the direction of Mecca. Minarets are towers used to call worshippers to prayer. Domes symbolize the vault of heaven and decorate the interior with intricate patterns. Famous mosques mentioned include the Al-Masjid an-Nabawi mosque in Medina and the Blue Mosque in Istanbul.