The document discusses plans for an open source geotagging application. It would help geotag media files without location metadata by allowing users to describe wide areas, not just single points. The application could eventually enable exploring historical photos geolocated around the user in real time, like a "time travel machine." While still in early stages, the project aims to crowdsource geotagging old files, create a metadata crawler, and develop multi-platform software to virtually explore the past and present through geotagged media.