Most identical doorways in a labyrinth

The Bhulbhulaiya labyrinth at the Bara Imambara, Lucknow, India, contains no less than 489 identical doorways. It includes several staircases and around a thousand separate narrow passages, some with dead-ends and others with precipitous drops. According to local legend, one of the Bhulbhulaiya’s blocked passageways connects, via an underground passage, to the Gomti river. This bewildering three-storey labyrinth was intended to keep unwanted intruders away from a large vaulted central chamber containing the tomb of Asaf-ud-Daula, Nawab of Awadh. It was finished in 1791.

This exemplary piece of Mughal architecture was designed by architect Kifayatullah .