Historypin is a very interesting website that is a global project in partnership with Google. The site allows people to view and share historic places pictures online. It’s an open community, which means everyone can upload an old photo, locate the place on a Google Map and Google Street View and pin it.
When uploading a photo you’ll need to enter date and location. The site then pins the historic picture to a current picture in an overlay, to show past and present. There is a timeline across the top so you can look for pictures during various years. Great for history buffs, or those interested in genealogy. it also allows you to add a story to the picture. LINK It only has about 32,000 pictures so far, but this is the type of site that gets better as more folks add pictures.