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. The Jungfraujoch is the lowest pass between the Jungfrau and Mönch.
The idea of a railway tunnel to the Jungfraujoch to make the glaciated areas on the south more accessible came into the mind of Adolf Guyer-Zeller in 1893. But the building of the tunnel took 16 years and the summit station was not opened before 1912. The goal was in fact to reach the summit of the Jungfrau with an elevator from the highest railway station inside the mountain. The complete project was not realized because of the outbreak of the World War I.
The train into the mountain leaves from Kleine Scheidegg, which can be reached by trains from Grindelwald and Lauterbrunnen. The train enters the tunnel running eastward through the Eiger shortly after leaving Kleine Scheidegg. Before arriving at the Jungfraujoch, it stops for a few minutes at two other stations, Eigerwand (on the north face of the Eiger) and Eismeer (on the south side), where the traveller can have a look through the excavated holes. The journey from Kleine Scheidegg to Jungfraujoch takes approximately 50 minutes including the stops; the downhill return journey taking only 35 minutes.
A large complex of tunnels and buildings has been constructed at the Jungfraujoch, mostly into the south side of the Mönch. There is a hotel, two restaurants, an observatory, a research station, a small cinema, a ski school, and the "Ice Palace", a collection of elaborate ice sculptures. Another tunnel leads outside to a flat, snow-covered area, where one can walk around and look down to the Konkordiaplatz and the Aletsch Glacier, as well as the surrounding mountains.
Appart from the Jungfraujoch, many facilities have been built in the two valleys north of the Jungfrau (the commonly named Jungfrau Region). In 1908, the first public cable car opened at the foot of the Wetterhorn, but was closed 7 years later. The Schilthorn above Mürren or the Männlichen above Wengen offer good views of the Jungfrau and other summits.