Built by Ghiyasuddin Tughlaq in the early 1320s as a fort-city, the Tughlaqabad Fort was built to safeguard the kingdom against the constant Mongol invasions. This fort is said to have a total of 52 gates out of which only 13 gates remain now. With almost 15 metres high walls, the fort is octagonal shaped and separated into three parts. The top of the huge walls contains parapets and bastions that add an eccentric look to the fort. Experience the grandeur of this man-made structure as you explore the halls and a lengthy underground corridor connecting the royal residencies.