BIJAI MANDAL, NEIGHBOURING DOMES, BUILDING AND DALAN (KALU SARAI) -
It is an unusual rubble built massive octagonal structure on a high platform, with sloping sides in the T ughluq style and a doorway at each cardinal point. It is believed to have been used as the residence by Shaikh Hasan Tahir, a saint of Sikandar Lodi's reign (A.D. 1488 - 1517). Muhammad Tughluq
(A.D. 1325-1351) is said to have used it as a tower for reviewing his troops. Some regard it as a bastion of Jahanpanah, the Fourth City of Delhi, built by Muhammad Tughluq.