You might also see glimpse of Rajasthani architecture which is considered to be very royal her and there in this fort which stands 18 metres long. There is total three arched gateways found here which are the Bara Darwaza also known as the Big Gate and it is the main gate in use today. The other bate is the 'Humayun Gate' and it might be named as Humayun gate because of the view of the Humayun tomb which is received from this gate and the other one is the 'Talaqi Gate' which is also know as the forbidden gate. You can visit the Sher Mandal here which is also know as the library of the Emperor Humayun. It was the private library of the Mughal Emperor and along long with that there is also a mosque present inside the fort that is the Qila-i-Kuna Mosque which was constructed by Sher Shah in the year of 1541. All the gates seen here are made up of sandstone and are double storeyed structure which are a true delight to look at. The Purana Qila has been standing strong over the years and is truly a perfect example of traditional architecture which is praised highly in India. If you ever plan a trip to Delhi, then do not forget to add the tourist destination spot of Old Fort to you plan.