The route to Everest Base Camp is probably the most famous mountain trek in the world. Every spring and autumn the trail fills with awestruck walkers who wind their way through friendly Sherpa villages. Porters and yaks ferrying equipment seem minute compares to the towering heights of Ama Dablam, Kangtega and Tawoche. Base camp sites astride glacial moraine beneath the unforgiving Khumbu Icefall, and above it all the mighty Everest.