Far from the bustling tourist paths that lead to Machu Picchu or Ollantaytambo, in the remote Andean highlands of Peru’s Sacred Valley, lies a mysterious site, hidden away within a rock cave. This site is called Naupa Iglesia, or more accurately, Naupa Huaca. This mysterious and unexplained structure is believed to be a prehistoric site left by a civilization far more ancient and far more advanced than the known Inca civilization that inhabited the region. [Via: UniverseInsideYou]