Nallamalla forest has innumerable number of caves which have a lot of religious and historical importance. Not much is known about a lot of these caves
Once you go down the road from patalaganga for about 10km you see one of the local cave’s which has a lot of importance and religiously sacred for the shivite community which is popular as the Akka mahadevi Caves.
This naturally formed cave just above the flow of the river Krishna upstream and stand without any support. This cave was the seat of many violent and secret Saiva sects such as the Kapalikas which fact in ancient medieval literature.
This cave got the name Akkamahadevi caves after Akkamahadevi of 12th A.D did penance in this cave and worshipped the Sivalinga which has formed naturally and exists in the deep and dark end of the cave. It is unexplored and dangerous to go on your own. If you really want to go in take necessary precautions and then go.