major mountain peaks. Archaeological excavations in the Andes have shown that humans travelled up to in pre-historic times. Permanent settlements as high as were established as far back as 12,000 years ago in the Andes. In the Greater Himalaya region, Lhasa, in Tibet, sitting at has been permanently occupied since the 7th century and many smaller settlements across the Greater Himalaya thrive at elevations exceeding . With humans living at high elevations for many millennia, nearby peaks to such settlements may or may not have been summited at some point in the past. However, many regions away from settlements may never have been explored, especially since some high peaks in the Greater Ranges are so remote that they were unknown to local inhabitants until they were sighted by explorers. The world's third-tallest peak, Kangchenjunga, has been summited a number of times, but on the 1955 expedition the first climbers of the peak agreed to honor the wishes of locals and not set foot on the topmost part of the mountain. Succeeding mountaineering parties may (or may not) have followed this tradition. Similarly, Nanda Devi has also been climbed but the topmost summit was not ascended and the primary summit is now off limits to climbers. Machapuchare had only one summit attempt back in 1957 when climbers came within of the summit; Nepal then banned future attempts. Gangkhar Puensum The mountain most widely claimed to be the highest unclimbed mountain in the world in terms of elevation is Gangkhar Puensum (). It is in Bhutan, on or near the border with China. In Bhutan, the climbing of mountains higher than has been prohibited since 1994. The rationale for this prohibition is based on local customs that consider this and similar peaks to be the sacred homes of protective deities and spirits, and the lack of high-altitude rescue resources from any locale closer than India. The prohibition was further expanded in 2003 when mountaineering of any kind was disallowed entirely within Bhutan. Gangkhar Puensum will likely remain unclimbed so long as the government of Bhutan prohibits it. Highest unclimbed non-prohibited peak It is unclear which is the highest unclimbed non-prohibited mountain. While some recognize only peaks with of topographical prominence as individual summits, the International Climbing and Mountaineering Federation uses a cutoff for determining individual summits. Based on the International Climbing and Mountaineering Federation's criteria, Muchu Chhish ( with a prominence of