Tham Khao Khong Chai
is a small cave in the 350-metre hill in Lan Sak district. It is believed that prehistoric men lived around the site, judging from the remains of stone tools and pottery. Within the cave are large flocks of bats. Hundreds of them can be seen hunting for food in the late afternoon and early evening. The cave is located some 5 kilometres from Lan Sak district.