Jama Masjid was commissioned by the Mughal Emperor Shah Jahan which is considered to be one of the biggest mosques in Old Delhi. The floor of the mosque has been totally covered with white and black marbles that give the look of prayer mat as in Mohammedan culture. It is situated on one of the busiest streets of Old Delhi, Chawri Bazaar Road.The outer courtyard of this mosque can hold around 25,000 people at a time, which is rectangular in shape and measures 75 m by 66 m. This mosque was constructed with the efforts of more than 5,000 workers, over a period of 7 years in 1628. The cost incurred during that period was about 10 lakhs rupees. Photography is strictly banned inside the premises during the praying hours.