These 2 paper models is designed by Tammy Yee. There is another the Roman Colosseum Building Paper Model on the site "Colosseum Papercraft Free Download", this version is from canon papercraft. For more Canon Papercraft – Architecture/Building Paper Models please visit the Topic:Canon Papercraft – Architecture/Building Paper Model Topic.
About the Arch of Constantine: The Arch of Constantine is a triumphal arch in Rome, situated between the Colosseum and the Palatine Hill. It was erected to commemorate Constantine I's victory over Maxentius at the Battle of Milvian Bridge on October 28, 312. Dedicated in 315, it is the latest of the existing triumphal arches in Rome, from which it differs by spolia, the extensive re-use of parts of earlier buildings.
About the Roman Colosseum: Please visit "Colosseum Building Paper Model" for introduction.
You can download these two building papercrafts from here: The Roman Colosseum and Arch of Constantine Building Paper Model Download