Chamonix has one of the highest cable cars in the world, which links the town to the summit of the Aiguille du Midi at 3842 m. It is based on an older system built in 1920, rebuilt in the first half of the 1950s over five summer seasons, fully modernized in 1979, and upgraded again in 2008. On the other side of the valley, another cable car links Chamonix to the viewpoint of Planpraz. A second line links Planpraz to the summit of Le Brévent at 2525 m. Many other cable cars exist in the valley, and are heavily used by skiers and residents. The Plan Joran chairlift at the base of Les Grands Montets is due to be replaced by a 10-person gondola for the Winter 2014/15 season.