It was built in 1784 by Asaf-ud-Daula as a famine relief project. The central hall of the Imambara, 50 metres long and 15 metres high, is one of the largest vaulted galleries in the world and the roof has been put together with interlocking bricks without using a beam or a girder.

An external stairway leads to an upper floor laid out as an amazing labyrinth known as the bhulbhulaiya, where a guide may be useful in finding one's way around. From the top there's a fine view of the city and of the Aurangzeb Mosque. Entry fee is Rs 10 and includes a visit to the ancient well or Baoli and to Rumi Darwaza. The Imambara is open from 0600 hours to 1700 hours.