Tapkeshwar Temple in Dehradun, also known as Tapkeshwar Mahadev Temple, is one of the most famous temples dedicated to Lord Shiva. Situated by the forest side, the main shivalinga at the temple is inside a natural cave. Water drops from the ceiling of the cave trickle down over the shivalinga in a continuous downpour, making for an interesting spectacle. The beautiful temple of lord Shiva established in between the two hills. Travelers from and around Uttarakhand state pay visit to Tapkeshwar Mahadev temple for its religious significance and adventurers go to see the water drops dripping in the Shiva ling in Drona cave. The water that drops down vanishes underground and can be seen only few yards away in the form of a stream. In Tapkeshwar Mahadev temple, cool sulphur-water springs where devoted pilgrims take bath before entering the temple.(Source : Wiki) There is a small stream of water there as i mentioned above.
Laxman Siddh Temple
Surrounded by dense trees there lies this very ancient temple Laxman Siddh. It is believed that this is the same place where Lord Laxman, brother of Lord Rama underwent repentance after slaying the demon king Ravana. Saint Swami Laxman Siddh underwent penance and cremated at this site.4. Sahastradhara–