Augmented reality app

Another 9/11 Memorial app -- available for iPhone only -- is the Explore 9/11 app. Among other things, this app has an augmented reality feature that allows users to see archival photos related to the 9/11 attacks that have been geotagged in a location next to where they're using the app. Here, in an image created on April 18, 2012, the app has superimposed an image of the aftermath of the World Trade Center towers' collapse on a live view of the new 1 World Trade Center tower.