Concept
Version 8
Created by Boundless
Architecture under Constantine
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"640px-Trier_Konstantinbasilika_BW_4.jpeg."
https://commons.wikimedia.org/w/index.php?curid=4378862
Wikimedia Commons
Public domain.