How to prepare for a high-altitude trek

Trekking in the Himalayas or the Andes is on many travelers’ adventure lists. A high-altitude trek is a fantastic experience — and, for many of us, the chance of a lifetime to see some of the world’s most awe-inspiring peaks. From a hike in Patagonia to a long-distance trek in the Dolomites, preparation for the high altitude is vital. Altitude sickness, caused by the...

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