Pre-columbian society left wondrous monuments to the modern world. Machu PIcchu is the crown jewel of these gifts. The massive stone compound was built on a mountain overlooking the verdant Urubamba Valley and town of Cusco. Today’s tourists take llamas and guides up the mountain trail for the chance to see the incredible construction of this amazing society. The site was abandoned around the 16th century and overtaken by the Peruvian rain forest. Modern anthropologists speculate that Machu Picchu was a temple for religious ceremonies, or perhaps some sort of luxurious vacation home for the elites of Incan society. The site is as mysterious as it is beautiful.