The Aga Khan, spiritual head of Ismaili Muslims, listens to a speech during the inauguration of the restored 16th century Humayun's Tomb in New Delhi, India, Wednesday, Sept. 18, 2013. It took six years of conservation works and 200,000 work days by master craftsmen to restore the tomb's Mughal finery, according to a press release. (AP Photo/Manish Swarup)