The Dambulla Cave Temple is a sacred Buddhist site. There is no entry fee to get into the temple on full-moon days; however, these days are especially busy because of the religious significance of this lunar phase. Devotees from all over the world make pilgrimage to this place.
There are over 80 caves documented in the area, but the most famous five are outfitted with impressive statues and paintings. Some of the caves date back to 1000 BC, when prehistoric Sri Lankans would have lived within them, so it is unsurprising that they would have created temples inside at that time. If you do plan to visit, please be aware that visitors must cover their shoulders and legs and remove shoes before entering the temple.