Adding historical imagery to ArcGIS Earth is a feature we have been missing for a while now. It will be beneficial if the team can incorporate World Imagery Wayback App in ArcGIS Earth. This will provide user to see their areas of interest in different time periods. In addition to adding the historical imagery, another thing that can add value to this feature is the swipe tool. These functionalities can really provide an edge to ArcGIS Earth in comparison to other similar applications.