Long before the Incas rose to power in Peru and began to celebrate their sun god, a little known civilization was building the earliest known astronomical observatory in the Americas. While not quite as old as sites like Stonehenge, these ancient ruins, known as Chankillo, are considered a "masterpiece of human creative genius", holding unique features not seen anywhere else in the world. Based in the coastal desert of Peru, the archaeological site famously contains a row of 13 stone towers, which together trace the horizon of a hill, north to south, like a toothy bottom grin. 1920px ThirteenTowersOfChanquilloFromFortress The...