History: Bada Imambara was built by 4th Nawab of Awadh- Nawab Asaf-Ud-Dowhala. It took 14 years to complete the construction. This great structure was started with a noble cause. During 18th century a devastating famine struck the Awadh Estate, the Nawab thought of a plan to provide food for its starving subjects. He decided to make magnificent buildings which would in turn provide employment to thepeople of the state. Thus the idea of Food- for- work was implemented. This basic concept is still prevalent in India and poor are always benefited of such schemes whenever sponsored by government.Architecture: The whole building is made of Lakhanui bricks (small size bricks) and lime plaster. No wood or metal has been used in the construction. It is said that this is the only building of the world without any pillar support though it is largest one.Structure: One can find the famous Bhul Bhulaiya. It is a network of more than 1,000 passages, 400-500 identical doorways and a number of staircases that goes up or down. Some of the doorways open into the balconies of the Central vault, whilesome open into the windows where from you can see the main road.