There have been reports that some of the world’s important historical and tourist spots are being overwhelmed by visitors. The globe’s burgeoning middle class has discovered its wings and has joined First World tourists to cram such draws as Machu Picchu in Peru and Venice, Italy.
Machu Picchu, the ancient Incan citadel, high in the Andes Mountains, has been visited by about 5,000 people each day from May to October, the high tourist . . .