Some people like to lay on the beach with a pina colada in hand, others like to spend the whole day shopping and some would prefer a whole day of relaxation at the spa. Well if these are not your kind of vacation then maybe a cave expedition would be right down your alley. Son Doong in Vietnam is the world’s largest cave is now open to public. This cave was only discovered 5 years ago and now visitor are flooding in hoping to get a tour of this magnificent cave. Click here to learn more about Son Doong Cave.