http://en.wikipedia.org/wiki/Jwala_Ji
Jai Jwala Maa The best known Jwala Ji shrine is located in the lower Himalayas in Jawalamukhi town of the Kangra district of Himachal Pradesh state of India, about 55 kilometers from the larger town of Dharamsala.The temple style is typical of Jwala Ji shrines, four cornered, with a small dome on the top and a square central pit of hollowed stone inside where the main flame burns endlessly.
The temple had an associated library of ancient Hindu texts, many of which were translated from Sanskrit into Persian at the orders of Firuz Shah Tughlaq when the Delhi Sultanate overran the Kangra area.
According to legend, when Sati's body was divided into 51 parts, her tongue fell here. This is represented by the flames.
The "eternal flame" at the Jwala Ji shrine in the village of Muktinath is located at an altitude of 3,710 meters at the foot of the Thorong La mountain pass in the Mustang district of Nepal.
http://en.wikipedia.org/wiki/Muktinath