Dambulla Buddhist cave temple interior by WLH Skeen c.1880
Dating back to the 1st century BC, this is the most impressive cave temple in Asia. It has five caves under a vast overhanging rock, carved with a drip line to keep the interiors dry. In 1938 the architecture was embellished with arched colonnades and gabled entrances. Inside the caves, the ceilings are painted with intricate patterns of religious images following the contours of the rock. There are images of the Lord Buddha and bodhisattvas, as well as various gods and goddesses.
The Dambulla cave monastery is still functional and remains the best-preserved ancient edifice in Sri Lanka. This complex dates from the 3rd and 2nd centuries BC, when it was already established as one of the largest and most important monasteries. King Valagambahu is traditionally thought to have converted the caves into a temple in the 1st century BC. Exiled from Anuradhapura, he sought refuge here from South Indian usurpers for 15 years. After reclaiming his capital, the King built a temple in thankful worship. Many other kings added to it later and by the 11th century, the caves had become a major religious centre and still are. King Nissanka Malla gilded the caves and added about 70 Buddha statues in 1190. During the 18th century, the caves were restored and painted by the Kandyan Kings. more infomation about Dambulla cave temple– wiki –