A little tougher than your average long-distance run, the 54K Trail des Aiguilles Rouges is one of Europe’s most technically challenging races. Luckily, it’s also one of the most beautiful – climbing over 11,800 feet up the Chamonix Valley for (literally) breathtaking views of snow-capped peaks, glacial lakes, and the majestic Mont Blanc. Traversée Servoz-les Houches par Vaudagne & Charousse