The premise of the site is simple but technically amazing – people upload pictures of a place and time in history and these images are then collated, mapped out (so they're easy to find) and can then be overlaid onto current pictures of those places.
Check out the 90 second video below to see how much potential the site has:
As genealogists and family historians we’re constantly trying to get a feel for what the world of our ancestors was like. History Pin is a new visual tool that will help us with this.
Keep in mind though that because the site relies on users to upload images the photo sets are by no means complete at the moment. But if it gets momentum and people start to upload more and more images, this is going to be a fantastic research tool for us all.