To view a map over time, you can either: In the toolbar, click Historical imagery . Click View Historical Imagery. This feature isn’t available if you’re using the Map basemap. To enable this feature, change your basemap to Satellite. Select how you want to view the map. To turn on historical imagery view, at the top left, click Historical ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.