The Incas used perfectly fitted rocks as bricks so the buildings would resist earthquakes
The Inca Empire was one of the biggest and most important pre-Columbian cultures in Latin America. At its peak, it spanned the territory surrounding the Andes mountains, and its capital was the city of Cuzco in modern-day Peru. They were exceptional builders, and many of their monumental stone buildings still stand today.
The rocks were pounded into shape and arranged so they would interlock. This meant that builders would have to lay the stones and then remove and recut them, so they sat flush. The final fit was so precise that there was no need for the mortar to glue the stones together.