13 Cities Where History's Darkest Secrets Are Hidden in Plain Sight

2. Machu Picchu: The Incan Enigma

Nestled high in the Andes Mountains, Machu Picchu is a testament to the ingenuity and architectural prowess of the Inca civilization. Discovered in 1911 by Hiram Bingham, this ancient city remains one of the most significant archaeological sites in the world. Despite its fame, much about Machu Picchu's purpose and construction remains shrouded in mystery. Was it a royal estate, a religious site, or a strategic military outpost? The precision with which the stones are cut and fitted together without mortar has led to speculation about the techniques employed by the Incas. Moreover, the city's alignment with astronomical events suggests a deep understanding of celestial patterns. The mystery of Machu Picchu is compounded by its sudden abandonment, with no clear evidence explaining why the Incas left this remarkable city.