intricate on the outer walls of diwan-i-am of agra fort

11th ages agra akbar ancient arch arches architectural architecture asia brick building carved carving castle century column columns culture delhi design destination details diwaniam dome door empire famous fine fort fortress gallery gate general grievances heritage hinduism historic history india indian intricate islam landmark mahal marble masterpiece middle monument mughal muslim old outer palace pillar pradesh public red sandstone sanstone stone structure style tourism tourist tower town travel unesco uttar wall walls work world