"Rome Reborn: The Basilica of Maxentius and Constantine."
This app features Beth Harris and Steven Zucker of Smarthistory as your guides. Teleport from stop to stop or roam freely through the awe-inspiring space. See the building's context in the ancient city and use the Time Warp feature to toggle between a Then and Now view.
The app runs on PCs (Macintosh, Windows) as well as VR headsets compatible with Oculus and Vive. You may purchase the app in the stores of Apple, Microsoft, Oculus, and Steam. Look for it, too, in your local VR arcade!