Underground way to dhams through Mahakaleshwar – Ujjain caves

http://en.wikipedia.org/wiki/Bhart%E1%B9%9Bhari

Siddha 

https://sites.google.com/site/nathasiddhas/raja-bhartrihari
Blog
http://anushankarn.blogspot.in/2009/11/bhartruhari-caves-ujjain.html

Cave
https://www.google.com/search?site=imghp&tbm=isch&source=hp&biw=1280&bih=643&q=Bhartrihari+Caves
Tube
https://www.youtube.com/results?search_query=Bhartrihari+Caves