Gangkhar Puensum, Bhutan
Gangkhar Puensum (White Peak of the Three Spiritual Brothers) in Bhutan is special because it is the largest unclimbed mountain. A major part of the struggle in climbing this mountain has been proficient mapping.
Until recently, mapping technology was not advanced enough to determine the locations of the relative peaks. In fact, the Gangkhar Puensum was so hard to find that the first climbing expedition couldn’t even find the mountain at all!
The Bhutanese government has also contributed to the difficulties in climbing the mountain; until 1983, no expeditions were allowed at all as the government was trying to preserve the sanctity of its natural monuments. But even after 1983, all expeditions have failed to summit. Locals pen this on the spirits that inhibit these mountains protecting their home, adding another layer of mystique to this mountain.