Fodor's Expert Review Camí dels Enginyers

With a trailhead at the ski area of Núria, at an altitude of 6,562 feet, the dramatic—and occasionally heart-stopping—"engineers' path" is best done in summer. The three-hour trek, aided at one point by a cable handrail, leads to the remote highland valley of Coma de Vaca, where a cozy refuge and hearty replenishment await. Call ahead to make sure there's space, and check weather conditions. In the morning you can descend along the riverside Gorges de Freser trail, another three-hour walk, to Queralbs, where there are connecting trains to Ribes de Freser.