In Hinduism, mountain is a place where the divine resides and therefore a living symbol and a source of strength. The thousands of hill shrines and several revered mountains are a testimony to the fact that Hinduism is deeply rooted in Nature. The most famous mountain in Hindu religion is the Mount   Kailash Tibet Tirumala  Tirupati   Balaji  Temple Sabarimala   Ayyappa  Temple 
  
Mount  Meru Mount  Mandara 
  
  
  
Puranas and epics are filled with legends associated with various mountains in Himalayas , the Vindhyas, the Satpuras, the Western Ghats  and the Eastern  Ghats .
The Markandeya Purana gives a list of seven Kula Parvatas – Mahendra in Orissa,Malaya  in Western Ghats , Suktiman in Eastern Ghats , Riksha, Vindya and Pariyatra all in the Vindhyas – which are considered as heaven. Srimad Bhagavad Purana also gives a list of sacred mountains.
The Markandeya Purana gives a list of seven Kula Parvatas – Mahendra in Orissa,
Earlier, some of the hill top shrines were accessible only through arduous treks and several people failed to make it to the shrine and many gave up halfway through the pilgrimage. But why were shrines built on such inaccessible mountain tops? 
Why Hindu Temples Are Built Atop Hills?
K.R. Vaidyanathan writes in his book ‘Pilgrimage to Sabari’The reason is that our sages thought that unless an element of rigor and sacrifice was added to worship, belief in God would not be firm and enduring.
A long and arduous pilgrimage is surely one way of communing with God. One sees nature in all its ruggedness and sublime beauty. The whole atmosphere is permeated with a deep and abiding faith in God. And it is this faith that impels the pilgrim to move on towards the shrine, however weak he may be in body and mind. He feels that he is on a mission and his only wish is to reach His shrine and have the eye-filling darshan of the Lord.
Finally, a he stands in His presence, with veritable tears of joy and thankfulness, he feels he has achieved the near impossible having surmounted the physical hazards of the trek, and experiences of profound sense of fulfillment.

