Machu Picchu is one of the seven wonders of the world, but when it was being built it suffered through at least two earthquakes a new study suggests. The earthquakes not only damaged walls, but a change in construction techniques occurred.

For more info, please read the original article by ScienceMag.org:
https://www.sciencemag.org/news/2019/10/machu-picchu-was-hit-strong-earthquakes-during-construction