Concept
Version 6
Created by Boundless
Neolithic Monuments
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"640px-Stonehenge,_Condado_de_Wiltshire,_Inglaterra,_2014-08-12,_DD_12.jpeg."
https://commons.wikimedia.org/w/index.php?curid=35323162
Wikimedia Commons
CC BY-SA 4.0.