Delhi started from here, traditionally this place is known for Indraprastha mentaioned in the Mahabharata. Archeological excavation in and around Purana Qila was completed in the year 1973. The remains of several pre historic and upto Sultan and Mughal period were found. Several sculptures and arts were one display at museum inside the fort.
Built by Sher Shah in the year 1541 the main prayer hall of this Masjid 51 meters by 15 meters, the centre of the façade is 16.5 meters in height. For beatification mixture of red and yellow stand stone with white and black marble is used. The Mughal style of Jharokhas and octagonal turrets at the corners are visible in this Masjid.