Places to See Before You Die: largest cave in the world

                         Photographer Ryan Deboodt, capture footage showing the immense size of
                                                   the Hang Son Doong cave in Vietnam.

              The cave was first discovered in 1991, when a local farmer stumbled across it and
              sought shelter there from a storm. Before the chance discovery, it had remained
              undetected beneath the Annamite Mountains in a remote part of central Vietnam
              for millions of years.

                       The drone captures the staggering height of the cave and people in the images
                                                         appear to be specks on the landscape.