Complex engineering and metal-work discovered beneath ancient Greek 'pyramid'

More than 4,000 years ago builders carved out the entire surface of a naturally pyramid-shaped promontory on the Greek island of Keros. They shaped it into terraces covered with 1,000 tonnes of specially imported gleaming white stone to give it the appearance of a giant stepped pyramid rising from the Aegean: the most imposing manmade structure in all the Cyclades archipelago.
Read more: https://www.theguardian.com/world/2018/jan/18/complex-engineering-and-metal-work-discovered-beneath-ancient-greek-pyramid?source=Snapzu