Imam Mosque is a mosque in Isfahan standing in south side of Naghsh-e Jahan Square. The mosque is also known as Shah Mosque, Royal Mosque and Abbasi Jame Mosque. Built during the Safavids period, it is an excellent example of Islamic architecture of Iran, and regarded as the masterpiece of Persian Architecture. The Imam Mosque of Isfahan is one of the everlasting masterpieces of architecture in Iran and all over the world. It is registered along with the Naghsh-i Jahan Square as a UNESCO World Heritage Site.