Lucknow, commonly referred to as The City of Nawabs, was once the capital city under the Nawabs of Awadh.
Some of the architectural marvels of that era that are still standing today, include the Bara Imambara.
This mystical marvel was built in 1784 by the then Nawab of Awadh, Asaf -ud-Daula.
It has the world's largest arched room without any pillars where the Nawabs used to hold their public hearings.
The Imambada is actually the replica of the tombs dedicated to the Holy Prophet and his family members.
The mystical marvel consists of three huge halls and has an amazing maze of corridors hidden in between its walls that are about 20 feet thick. The dense, dark maze called the 'bhul bhulaiya' is a network of more than 1000 labyrinthine passages, some of which have dead-ends, some end at precipitous drops while others lead to entrance or exit points.