The classic 4-day route is along hand-hewn stone stairs and trails through sumptuous mountain scenery and amazing cloud forest, past rushing rivers and dozens of Inca ruins. The zone is inhabited by rare orchids, 419 species of birds, and even the indigenous spectacled bear. The trek begins at Qorihuayrachina near Ollantaytambo -- more easily described as Km 88 of the railway from Cusco to Aguas Calientes. The 43km (27-mile) route passes three formidable mountain passes, including the punishing "Dead Woman's Pass," to a maximum altitude of 4,200m (13,700 ft.). Most groups enter the ruins of Ma
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