This is also called Sudam Smast. In Pashto language ‘Smast’ is a small cave where one can hide from rain and storm. This is about 7 miles from Rustum near Pirsai village. It can also be approached from katlang area. There are different opinions about this site. However the most convincing one is that this was the place of worship of Buddhist monks. The valuables have been taken away from the site but the cave is beautiful.