Everest - Buddhists believe a goddess lives in the mountain and she decides who summits, who doesn't, who makes it down safely, and who doesn't. She doesn't take kindly to big egos or those who try to "conquer" her. Humble respect always.
Here's an unusual picture of a rock cairn - unusual in the sense that Mount Everest is in the background! Now that I think of it, MAYBE the custom of stacking rocks in this very Zen fashion originated in Nepal.