The principal cave is the largest Chaitya among Buddhist cave in the country, Being 15meters wide and 16 meters high. The most remarkable feature of the cave is its arched roof supported by wooden beams which have astonishingly survived the onslaught of elements for more than 2,000 years. The Wooden Umbrella above the Chaitya is unique in the Buddhist caves around the world. There is absolutely no sign of any corrosion. It is the finest example of the kind perhaps in the world.