Antharagange
Another intersting trekking destination, good for Cave Exploration too. This place is located 70 Kms from bangalore. One has to take Old Madras Road to Kolar and ask for villagers for further direction.
Following blogs contain good description on Antharagange
http://justmybiog.blogspot.com/2006/01/antharaganage-another-getaway.html
http://modhu.blogspot.com/index.html
Happy Trekking!