Isfahan was once one of the largest cities in the world. It was strong from 1050 to 1722, particularly in the 16th century under the Safavid dynasty. During this time it was the capital of Persia for the second time in its history. Even today, the city keeps much of its past glory. It is famous for its Islamic architecture, with many beautiful boulevards, covered bridges, palaces, mosques, and minarets.