[Someone]

Even ignoring that you'll need multiple photos to do the 3D reconstruction you need for augmented reality, that 100 year old photos may be lacking in resolution, and giving a few decades of leeway either way for that "100 years ago" I doubt even Google has enough data to have a reasonable chance of having a photo for random locations you might point your camera at.

[paul9290]

Does not have to be exact and a real photo from that time in that spot or a tad far away and or an arial shot can be used to create renderings.