What you read in the headline is true. We are speaking about the Jwala or Jwalamukhi temple in the the lower Himalayas in Jawalamukhi town of the Kangra district of Himachal Pradesh, India. Revered as one of the significant Shaktipeethas, this temple is considered as one of the most ancient temples besides the famous Vaishno Devi temple. The uniqueness here is that ‘flame’ in the cave, which can be seen, represents the goddess, instead of an idol. Interestingly, there is no proper evidence on the history timeline associated with this flame (glowing with blue outline), and is said to have been on since immemorial times, inside a cave. There are also eight other flames present in the cave, each representing other forms of the Goddess.
The flame is considered as the representation of the main deity’s tongue, which fell in the shrine after getting disintegrated from the Goddess Sati’s body (on the backdrop of Shaktipeethams) and fell in this shrine, because of which, this shrine is revered as one of the four Adi Shaktipeethams.
Efforts by several scientists, kings (Akbar) across centuries, governments, among others, to crack the mystery behind these flames failed, and is still a mystery. Some even attribute to the natural gas reserves in the cave that are making these flames remain on continuously, but failed to prove it.