Bara Imambara

The Bara Imambara is an eighteenth-century Shia Muslim congregation hall in Lucknow, built by the Nawab Asaf-ud-Daula during a famine as a relief employment project. Its central hall — 50 metres long, 16 metres wide, and 15 metres high — is one of the largest arched halls in the world built without timber or steel supports, constructed instead using interlocking brickwork. The Bhulbhulaiya, a labyrinthine rooftop maze of identical corridors within the upper structure, has become the building's most visited feature.