This ancient mountaintop city is a beautiful and mysterious place, sure. But our own Peruvian puzzler is this: Why on earth is Machu Picchu such a popular Red-Handed picture spot? Our records indicate it gets quite a few visits from Rake readers. And they look to be a tough bunch, too. St. Paulites Katie and Mike Waller, for instance, snapped this lovely shot on completion of a grueling hike along the Inca Trail. Wrote Katie: “I don’t think we made our high school Spanish teachers proud, but after our four-day trek through the Andes to Machu Picchu, our gym teachers certainly would have given us a passing grade.”