Concept
Version 9
Created by Boundless
Architecture under the Nervan-Antonines
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"640px-Lazio_Tivoli2_tango7174.jpg."
https://commons.wikimedia.org/w/index.php?curid=12447426
Wikimedia Commons
GNU FDL.