Tughlaqabad Fort
Tughlaqabad Fort is a ruined (collapsed or broken) fort in Delhi. It was built by Ghiyath al-Din Tughluq in 1321. He was the founder of Tughlaq dynasty of the Delhi Sultanate  of India. Ghiyasuddin built the third historic city of Delhi, the Tughlaqabad. This fort was built in Tughlaqabad. This city was later abandoned (left) in 1327.