The Junfrau is perhaps the most dramatic, certainly the most memorable, mountain scenery in the whole of Switzerland.The Jungfrau is one of the main summits in the Bernese Alps, situated between the cantons of Valais and Bern in Switzerland. Together with the Eiger and Mönch, the Jungfrau forms a massive wall overlooking the Bernese Oberland and considered one of the most emblematic sights of the Swiss Alps. The construction of the Jungfraujoch railway east to the summit in the early 20th century made the area one of the most frequented places in the Alps. Along with the Aletsch Glacier lying on the south, the Jungfrau is part of the Jungfrau-Aletsch Protected Area which was declared a World Heritage site in 2001. Once difficult to access, the Jungfraubahn cog railway now runs inside the mountain, up to the Jungfraujoch railway station at 3,454 m (11,332 ft), the highest in Europe.