Mark, recently bagged summit six, the Vinson Masiff. Vinson is probably the most challenging mountain to get to in terms of logistics, weather and temperature. Vinson is located on Antartica. Here’s a list of things that live on the continent–penguins–that’s it, nothing else, no plants, not trees, not even bugs. Suffice to say, the South Pole is an inhospitable place to spend a few weeks outside.