Vietnam has many natural wonders worth exploring and one of them is Hang Son Doong, a stunning natural cave that is the largest of its kind in the world. Located in the Phong Nha-Ke Bang National Park which can be found in the country's Quang Binh province, this cave system is around 500 feet in height and 650 feet wide, not forgetting about 5.5 miles in length! In fact, one will find over 150 caves at this site made up of intriguing stalagmites, cave pearls and more.