Inca’s stone masonry: Part of a wall in Macchu Picchu, Peru. Ancient architecture at its finest. No Mortar used to create these walls. Each stone fits so perfectly together that you cannot fit a piece of paper through a crack!
Klerksdorp spheres "By all scientific accounts, theses rounded objects found in pyrophyllite deposits around Ottosdal, South Africa are three billion-year-old rocks that were naturally formed by carbonate concretions.