Human civilization has reached remarkable achievements in quarrying, cutting, shaping, transporting, polishing, fitting, and sculpting megaliths — even in melting certain types of stone. Yet, some techniques from lost civilizations remain beyond our explanation. How were they accomplished? Iconic examples include the Egyptian pyramids, Machu Picchu’s “Sky City,” and the Stonehenge circle in Britain. The specific methods have long been lost. Today, we can only rely on existing resources and ar...

Human civilization has reached remarkable achievements in quarrying, cutting, shaping, transporting, polishing, fitting, and sculpting megaliths — even in melting certain types of stone. Yet, some techniques from lost civilizations remain beyond our explanation. How were they accomplished? Iconic examples include the Egyptian pyramids, Machu Picchu’s “Sky City,” and the Stonehenge circle in Britain. The specific methods have long been lost. Today, we can only rely on existing resources and ar...