Machu Picchu was built by the Incas around 1460, as a refuge for the elite of their aristocracy. But it was abandoned after 100 years.
Archeologists don’t know why it was abandoned. They think the Incas were killed by smallpox, a disease brought by the Spanish.
However, the Spanish colonizers never found the city of Machu Picchu, because it was hidden high in the mountains. So they didn’t destroy it.
The building technique used by the Incas was called ‘dry stone’ because it used no mortar. This allowed the stones to move slightly during earthquakes.
As a consequence, the walls remained in good contitions after many earthquakes. So the city of Machu Picchu is still preserved today, and you can visit it if you want.
This post was based on Pathways 1 pg 70 by National Geographic. Wanna know more? Access https://www.machupicchu.org/machu_picchu_history.htm to expand your culture.