The entrance fee is 25 pesos, of which two mountaintops have been developed into resorts, accommodation, dining, viewing and entertainment facilities are complete. Climb to the top of the tour center to see the full view of Chocolate Mountain. Chocolate Hill is composed of limestone, but there is no cavern system or underground passage in the limestone area. Regarding its formation, geologists have given various hypotheses such as limestone weathering, subocean volcano eruption, seabed uplift and so on. The latest explanation is that it may have been due to an ancient volcanic eruption, a large spew of rocks scattered, covered by limestone, and finally formed the chocolate mountain we see today under the lifting of the seabed. But experts still have no consensus on this explanation. Geologically, the most widely accepted theory of their formation is that the island was formed from the rise of the sea, and the Chocolate Mountains were the product of thousands of years of rainwater washing over the shells, coral formations and impervious clay layers of the ground. The hills are close together like hay piles in the fields. Some have domes, others are tapered. They are covered with grass and are green in the rainy season. During the dry season in February-May, the hot sun drys the grass into chocolate brown. The vegetation of Chocolate Hills is also strange: they are basically grasses and not trees, and the plants in other forms of the mountain around them are crazy.