Bara Imambara (Urdu: بڑا امامباڑا, Hindi: बड़ा इमामबाड़ा) is an imambara complex in Lucknow, India, built by Asaf-ud-Daula, Nawab of Lucknow, in 1784. It is also called the Asafi Imambara. Bara means big, and an imambara is a shrine built by Shia Muslims for the purpose of Azadari. The Bara Imambara is among the grandest buildings of Lucknow.
The complex also includes the large Asfi mosque, the bhulbhulayah (the labyrinth), and bowli, a step well with running water. Two imposing gateways lead to the main hall.
The architecture of the complex reflects the maturation of ornamented Mughal design, namely the Badshahi Mosque - it is one of the last major projects not incorporating any European elements or the use of iron. The main imambara consists of a large vaulted central chamber containing the tomb of Asaf-ud-Daula. At 50 by 16 meters and over 15 meters tall, it has no beams supporting the ceiling and is one of the largest such arched constructions in the World.
There are eight surrounding chambers built to different roof heights, permitting the space above these to be reconstructed as a three-dimensional labyrinth with passages interconnecting with each other through 489 identical doorways. This part of the building, and often the whole complex, may be referred to as the Bhulbhulaya.
Known as a popular attraction, it is possibly the only existing maze in India and came about unintenionally to support the weight of the building which is constructed on marshy land. Asaf-ud-Daula also erected the 18 meter (59 foot) high Rumi Darwaza, just outside. This portal, embellished with lavish decorations, was the Imambara's west facing entrance.
There is also a blocked (tunnel) passageway which, according to legends, leads through a mile-long underground passage to a location near the Gomti river. Other passages are rumoured to lead to Faizabad (the former seat of power of the Nawabs), Allahabad and even to Delhi. They exist but have been sealed after a period of long disuse as well as fears over the disappearance of people who had reportedly gone missing, while exploring.