Tourist attractions don't end where it's easily accessible, apparently, even the darkest parts of the world can also be traveled now. Indeed, National Geography's Anthony De Vivo suggests the same, for him burrowing down them will is another worthwhile activity. If vacationers are already tired of trekking mountains or swimming in beaches, h presents a new attractive feat anyone can try. And, his latest expedition will be opened here.

Definitely, spending time in Earth's darkest and scariest natural wonder isn't a common thing to do. Although, the rise of travel industry brought many in finding more activities vacationers can do. Apparently, once or twice visit in seas and mountains make them thirst for different exploits.

So, National Geography's Anthony De Vivo went for a search of the most beautiful caves, he explained: "Every day inside a cave is still like the first time emotionally, you have the same feeling, the joy of exploring, and the pleasure of getting to know more about our planet." For him, he would rather be there than anywhere he could be. In fact, he had 40 cave expeditions in his belt now, and the most recent are the Puerto Princesa Subterranean River National Park or Puerto Princesa Underground River.

Philippine's natural wonder, Puerto Princesa Underground River is actually believed as the longest under-river system in the world. During 2012, it was included as one of the eight wonders of the world, and up to now, it's still on the list. The beauty of the place comes from its mysterious ambiance, amazing stalagmites and stalactites formations add more to it. On the entrance of the cave, bats will immediately greet anyone who enters.

The river system is located at Palawan area where the unexplored gems of the Philippines are located. Lastly, tourists can enjoy a lot of things in there, it's not only about the caves but its lagoons are also something to see likewise.