The Ancient Lego Bricks of Sacsayhuaman

Carved many centuries ago with incredible mathematical precision, these colossal boulders form part of the lower wall of Sacsayhuaman fortress, positioned high on a mountain above the Andean city of Cusco. Utilising technology that was way ahead of its time, which has also enabled them to survive severe earthquakes, these giant rocks fit together so well that it is impossible to slide a piece of paper in between them. Astonishing.