In India, the Aga Khan Trust for Culture (AKTC) has plenty of experience in transforming neglected monuments. In Nizamuddin itself, it has worked on some 60 over 13 years, including the magnificent Humayun’s Tomb. But Mah Banu’s tomb was special. "It was used as a quarry," says Ratish Nanda, CEO of AKTC India, "all the way from the 18th to the mid-20th centuries. The loss of stone was staggering, almost every square inch required work, and a lot of detective work too."