Peru's outdoor geography spans vertical zones from Amazon basin to Andean snow in a concentration that is almost absurd. The Inca Trail to Machu Picchu is the world's most famous ancient trail, but it's the Salkantay trek — a five-day route through high passes and cloud forest descending to the same destination — that most serious trekkers prefer for its combination of glaciated peaks and tropical transition. The Colca Canyon, twice as deep as the Grand Canyon, is a day-hike viewpoint for Andean condor thermal soaring; the Cruz del Condor viewpoint at dawn delivers reliable low-altitude passes by the world's largest flying bird. The Amazon basin at Manu National Park — one of the most biodiverse places on earth — delivers river-based wildlife watching with giant river otters, giant anteaters, and macaw clay licks. Tours by locals who know the landscape beyond the obvious map pins reveal the hidden gems. It really hits differently.