With the Taj Mahal overshadowing it, one can easily forget that Agra has one of the finest Mughal forts in India. By visiting the fort and Taj on the same day you get a Rs50 reduction in ticket price. Construction of the massive red-sandstone fort, on the bank of the Yamuna River, was begun by Emperor Akbar in 1565. Further additions were made, particularly by his grandson Shah Jahan, using his favourite building material – white marble. The fort was built primarily as a military structure, but Shah Jahan transformed it into a palace, and later it became his gilded prison for eight years after his son Aurangzeb seized power in 1658.