It's mid-afternoon, and our small group is catching its breath after slowly scaling the steep, winding trails of Peru's Colca Canyon. We sit in silence as we look over an ancient landscape of sheer ...

Add Yahoo as a preferred source to see more of our stories on Google. This is one trek you shouldn't miss. kovgabor79/Getty Images While it's true the Inca Trail to Machu Picchu might be the most ...