3. Trolltunga, Norway
Trolltunga is a rock formation situated about 1,100 metres above sea level in Ullensvang Municipality in Vestland county, Norway. The cliff juts horizontally out from the mountain, about 700 metres above the north side of the lake Ringedalsvatne. It is commonly known among trekkers as The Edge of the World. Trolltunga is a very challenging route. The hike starts in Skjeggedal and goes through the high mountains, takes 10-12 hours (27,5 kilometers / 17 miles in total to Trolltunga and return) and the ascent is about 1,000 meters (3,280 feet).