In a nation not short on natural beauty, Quang Binh Province stands out with its ‘dark secrets.’ Paradise Cave is 60km away from Dong Hoi City, and is lesser-known than Phong Nha, but its wider space and less crowded route are advantages to bank on. For the next 7km of Paradise Cave to which access is limited, adventurers can purchase a separate tour and enjoy its “wild, unspoiled” side. This tour needs trekking equipment and cave experts as escorts.