Don't think I have read about any well-funded startups in this area yet, but boy there's a business opportunity here. Aside from the major historical locations,

Don't think I have read about any well-funded startups in this area yet, but boy there's a business opportunity here. Aside from the major historical locations, most every state/city in the US has a "historical society" of some sort that has thousands/millions of old pictures laying around. My own (Minneapolis) had a project many years back where they went around and took a pic of every single house in the city limits. I'd like to be able to go to a cool neighborhood and point my phone to a street corner and see what was there, sort of my own interactive history lesson. Rather than each of these government agencies or museums figuring out how to do an aug reality app on their own dime, someone needs to build the template/service and offer it up.