They were polishing semi-precious stones & marble.
Red Fort of Agra, it is about 2.5 km northwest of its much more famous sister monument, the Taj Mahal.
It is the most important fort in India. The great Mughals Babur, Humayun, Akbar, Jehangir, Shah Jahan and Aurangzeb lived here, and the country was governed from here.
The fort can be more accurately described as a walled palatial city.
