Nice tutorial, CWIC. I think some of these, like the one at Antietam, were not done with a smartphone or tablet but some sort of device that captures a 360 degree view as you walk, similar to that on top of the Google street view cars.
For instance, see the reflection in the glass here
:
https://www.google.com/maps/@39.474...1PsNPSW2fAPrOJmDtA!2e0!7i13312!8i6656!6m1!1e1
Also noticed that the Wilson's Creek battlefield can be 'toured' as well:
https://www.google.com/maps/place/W...0x87cf6792b034415b:0xb390bb03c3d4ddac!6m1!1e1
For instance, see the reflection in the glass here
:https://www.google.com/maps/@39.474...1PsNPSW2fAPrOJmDtA!2e0!7i13312!8i6656!6m1!1e1
Also noticed that the Wilson's Creek battlefield can be 'toured' as well:
https://www.google.com/maps/place/W...0x87cf6792b034415b:0xb390bb03c3d4ddac!6m1!1e1