Variable snow conditions mean summits of mountains can differ from year to year. One mountain whose summit is unrecognisable from when it was first climbed in 1956 is Manaslu in Nepal. Its summit has changed so much that modern mountaineers could almost be climbing a different mountain.
Read more- World firsts are meaningless, personal firsts are profound
- Book review: Everest The First Ascent by Harriet Tuckey