From your web-browser (Mac or Windows), you can walk around the "Notre-Dame des Victoires" church (a gothic church from the XVth century) and navigate in front of typical ancient houses.
The virtual reconstruction of the area in 3D was based on urban plans and aerial pictures. Precise measurements and high-definition textures were gathered on-site. The task was not easy because this is a popular touristic area with a lot of people walking around during the day. Also a part of the church was under renovation at the time.
You can try the interactive 3D demo here.