The location of so many graves in this vicinity is explained by their proximity to the Dargah of Nizamuddin Auliya. In fact even the tombs of Humayun, Isa Khan, Khan-i-Khana and all the other tombs located in this area are there because of Nizamuddin's Dargah.
Humayun's Tomb was placed under UNESCO's care recently as a World Heritage Site. These workers are carving out a new panel for one of the ornamental walls. Each one takes four months of meticulous, and poorly paid, work.