The four men lost in 1865 have not been the only fatalities on the Matterhorn. In fact, several climbers die each year due to a number of factors including the scale of the climb and its inherent dangers, inexperience, falling rocks, and overcrowded routes. The Matterhorn is thus amongst the deadliest mountains in the world. By the late 1980s, it was estimated that over 500 people have died whilst attempting its summit since the 1865 ascent, with an average of about 12 deaths each year.