The Metro Alpin is an underground funicular situated above the Swiss town of Saas Fee, in the canton of Valais. Opened in 1984, it links the Felskinn cable-car station (2980 m MSL) on the shore of the Fee Glacier to the Mittelallalin (3456 m) in the north flank of the Allalinhorn. The Felskinn–Mittelallalin Tunnel has a length of 1,749 m, with an altitude difference of 476 m between the two stations. The Metro Alpin is the highest funicular in the world. Being a fully underground railway, it is also considered the highest subway in the world.