It is believed that the construction of this grand building was started in 1785 when a devastating famine had hit Awadh, and the nawab’s objective was to provide employment for people in the region for almost a decade while the famine lasted. It has large underground passages which have been blocked up. A staircase from outside leads to a series of labyrinths known as Bhool-Bhulaiyan, which is a complicated entanglement of zig-zag passages.