For those today who think there is nothing left to seek or nothing left untrammeled, Antarctica awaits -- serene, magnificent, empty, surreal and beautiful beyond words. And although the Seventh Continent is the world's most inaccessible, it is no longer a pipe dream for adventurers who place it high on their bucket lists. Pictured here, Quark Expeditions' 189-passenger Ocean Diamond. Photo by Lisa Maclean; posted July 1, 2014