Chacaltaya, Cordillera Real, Bolivia. Was once the highest ski resort in the world. I highly recommend coming here and climbing Chacaltaya if you do not have the extra days to climb Huayna Potosi (or climb both if you do have the time!). Grab some snacks before the climb because you'll need the sugar with the high altitude here, have plenty of water, take your time, and enjoy the mate de coca at the end to relax and take it all in. The views are absolutely incredible here. Dress warm!