Located opposite the Pragati Maidan, the Purana Qila (Old Fort) is placed on the site of the ancient city of Indraprashtha. It is believed that the Pandavas had built their capital, Indraprastha at the site of the fort. According to Archeological evidences like pottery dating back to 1000 BC, found within the fort premises support the theory of existence of Indraprastha at the same site. Similar pieces of pottery have been recovered from other sites associated with Mahabharata. Apart from which, the fact that until early 20th century a village called 'Indrapat' existed in this area substantiates the theory. With its massive rubble wall and imposing gateway houses, the fort definitely has been witness to a lot of events in history. This nearly 500 years old fort, though now in ruins, was once the seat of power and administration for many rulers. The legendary Rajput ruler Prithviraj Chauhan ruled from here till being defeated by Ahmed Shah Abdali in the battle of Panipat. The Old Fort was also part of the city of Dinapanah (Refuge of the Faithful) which Humayun started building in 1533 and completed five years later. After the Afghan King Sher Shah Suri defeated the Mughal emperor Humayun, he renamed the fort as Shergarh. Apart from renaming the fort, Sher Shah also added some more buildings within the complex. Out of the three gigantic entrance gateways that Purana Qila had, only one remains open now - the Bara Darwaza. Now there's a small archaeological museum just inside the main gate. The top of the Gateway offers some fabulous views of the city. Inside the fort is an impressive mosque called Qila-i-Kuhran Masjid, built by Sher Shah in 1541. The central section of the mosque made up of white marble and bright red sandstone give it a real touch of class.Another fascinating building inside the fort is the Sher Mandal, an octagonal building in red sandstone. The two-storied pavilion has steep steps leading up to the roof. Once Humayun recaptured Delhi in 1555, he refurnished the Sher Mandal as his library. Did you know? A light & sound show held by the Department of Delhi Tourism every evening is the perfect way to experience the beauty and charm of this historic fort. Timings and Tickets are available from the tourist office.