I have recently come across some information on an underground, extensive cave system that has been used for some time by the native Shuar. This sprawling underground network, located in the Andes mountain range, is said to contain a chamber filled with books made from various metals and also a giant, golden skeleton housed in a crystal like sarcophagus. I've only found one really good article on the library and i'm posting the link for all. Anyone with more information or knowledge opn the matter: please share your thoughts! The man who claimed to find this metal library, petricio Jaramillo, died mysteriously before he could show this location to archaeologists(stan hall). I looked for any thread on this topic and couldn't find one so here we go!
http://www.philipcoppens.com/metal_libr.html