Shah Jahan started construction of the Red Fort in 1638 which was completed in 1648. It contains halls, palaces, apartments, a mosque and gardens displaying Mughal grandeur. Though attacked in 1739 and 1857, it remains an impressive testimony to Mughal rule. The fort has thick red sandstone walls with turrets and bastions within a moat. It covers two square kilometers and the walls vary from 18 to 33 meters high. Today it reflects the glory of the Mughal era and its magnificence transports visitors back in time through its sound and light shows.