Five centuries after its construction, Machu Picchu's megalithic walls remain a mystery that modern engineers struggle to replicate. We investigate the ashlar masonry technique that has survived countless earthquakes, examining theories about how the Inca shaped and moved 50-ton granite blocks into perfect interlocking puzzles. Join us as we explore whether bronze chisels, sand abrasion, or something else entirely created stonework that rivals anything produced with today's technology.