This is a video of the Colina Suchuna, a strange, vitrified rock at Sacsayhuaman, Cusco, Peru. See all the structures that were made in this rock, it looks as if they were pressed into the rock when the rock was soft once. The rock is so smooth that it is used as natural slides. It is considered an Hanan Pacha structure by Jesús Gamarra, also because it is surrounded by walls with perfect fitting stones from the Uran Pacha time. For more, see: