- See rock formations in the Phong Nha-Ke Bang National Park which are known to exist since the Palaeozoic period - Slip through narrow and sloppy trails in the Dark Cave by only using headlamps to light your path - Enjoy an adrenaline-filled day in the Dark Cave by trying thrilling activities like zip-lining - Pass through the world's longest wet cave: Phong Nha Cave, and see amazing stalagmite and stalactite structures