Though just over the border in France, the Mont Blanc Marathon is one of the world’s best-known series of mountain races, and certainly worth noting here. Events include a Vertical Kilometer, a 10 km, 23 km, 42 km, and a 90 km distance. New recently, is a “Duo Étoile” night race for teams of two runners. There are even three children’s event, ranging from 800 meters to 3 km. The Mont Blanc Marathon events are based in Chamonix, France, the internationally-recognized home of alpinism0– and, now, trail running.