 There are still many colonial buildings in the Dhaka Sadarghat, Armanitola, and Farashganj areas of Old Dhaka.Binat Bibi Mosque was built in 1454 in the Narinda area of Dhaka during the reign of the Sultan of Bengal, Nasiruddin Mahmud Shah (r. 1435 – 1459), and is the oldest brick structure that still exists in the city.Important landmark buildings constructed during British rule include the Old High Court Building, Bangabhaban, Curzon Hall and Mitford Hospital.