The regions of the Bernese Oberland and Valais have been popular tourist destinations since the 19th century. The Jungfrau was first climbed in 1811 and the Finsteraarhorn in 1812. The first tourists came mostly in summer, but in the 1930s winter sports became also popular. On the north side visitors are only able to visit the site via the Jungfrau railway which leads to the Jungfraujoch. The railway has turned the site from an inaccessible mountain face to a very accessible site visited by large nearby populations. The Jungfrau railway was built between 1870 and 1912, taking visitors from Kleine Scheidegg (2,061 m) to Jungfraujoch (3,454 m), the saddle between the Mönch and Jungfrau. On the south side the area of Riederalp-Bettmeralp hosts most of the visitors. Other inhabited regions on the margin are Kandersteg and the Lötschental. The network of foot-paths is well developed around the site but nonexistent through it, the centre being inaccessible to walkers. The site can only be accessed by experienced mountaineers and there is a series of 37 shelters and five mountain refuges with a total of 1,582 beds, managed by the Swiss Alpine Club. The Aletsch ecological centre in Riederalp is run by Pro Natura functions as a visitor center.