Architecture of arched colonnade structure in Diwan I Aam at Agra Fort, Agra, Uttar Pradesh, India Audience hall of the 17th-century Red Fort, built in red sandstone with intricate arched colonnades.Built by the Emperor Akbar (ruled 1556-1605) between 1565-79, the great red sandstone fort at Agra dominates a bend in the Yamuna river. It is a strong military edifice which is also embellished with fine architecture. Beautiful pavilions and balconies grace terraces overlooking the river.