Rajon Ki Baoli also referred as Rajon ki Bain is a famous stepwell near Adham Khan's Tomb in Mehrauli. This magnificent three-storeyed stepwell is believed to have been built by Daulat Khan during the reign of Sikandar Lodi in 1516. The baoli was used by masons for some time. Hence, it got its name as Rajon Ki Baoli.
The baoli is one of the highlights of Mehrauli Archaeological Park and a favourite with every visitor. Perhaps it is to do with manner in which it is revealed to the eye: the entire structure is subterranean, so as one approaches the entrance, one can only see the top-most storey. And each level of the baoli slowly reveals itself to the visitor as one walks towards its steps. The baoli-complex has a 12-pillared tomb and a mosque with some pretty plaster decoration on it.