I think that in the future, the following phenomena are likely to proliferate:

- high-res satellite and airplane imaging of the globe

- public geotagged photos, including compass bearing

- Google Street View road images

- public security cameras on public streets

All of this data can be integrated using software like Microsoft's PhotoSynth, to stitch together a gigantic 3D model of the real globe.

Then, people with Voxel Vision will be able to look around at streets and landmarks that are interesting but physically occluded.