1. Bara Imambara in Lucknow is an architectural marvel built by Nawab Asaf-ud-Daula in 1784. It is a Shia Muslim shrine that also contains a mosque and a labyrinth known as Bhulbhulaiya. The main hall of the Imambara is one of the largest arched constructions in the world without any beams supporting the ceiling. The Bhulbhulaiya is a maze with more than 1,000 narrow and winding passages. The complex also includes a stepwell called Shahi Baoli.

2. The Bara Imambara is open to visitors from 6 am to 5 pm every day. The phone number for inquiries or further information can be obtained from the Uttar Pradesh Tourism Department website.

3. The entry fee for Indian nationals is around INR 50, while foreign tourists need to pay a higher fee. There may be additional charges for entering the Bhulbhulaiya or photography. The Bara Imambara is easily accessible by public transport such as buses, taxis, and auto-rickshaws. Visitors can also hire a guide to explore the complex and learn more about its history and significance.