Circling the globe with National Geographic in the comfort of a private jet is a once-in-a-lifetime adventure.  We encountered legendary places from Machu Picchu and Tibet to the Taj Mahal and Marrakech and experienced natural wonders such as the Great Barrier Reef, the Serengeti Plain, and the island paradise of Samoa.  The highlight for me, however, was 36 sleepless hours photographing the moai of Easter Island.