The image in the question is from Wikimedia Commons https://commons.wikimedia.org/wiki/File:Easter_Island_Ahu_%282006%29.jpg
Attributed to: Leoboudv
License: Creative Commons Attribution 2.5 Generic
The image in the Expanation is from Wikimedia Commons https://commons.wikimedia.org/wiki/File:Mo%C3%A1is.jpg
Attributed to: Aurbina
License: Public domain