8. Puerto Princesa Underground River Within a Cave
This is a National Park that features an underground river within a cave. The park is situated in Puerto Princesa in Phillipines. The park is unique since it is located in the earth of the city center, featuring St. Paul Underground River that passes underground in the city center on the Northern Coat of Phillipines Island.
This cave cum Underground River was discovered in 2010. Strong rock formations such as stalagmites and stalactites cave a dome like shape above the underground river. This National Park has been referred by UNESCO a World Heritage Site.