For the service's 20th anniversary, Google was inspired by a social media trend from last year in which people shared historical images of locations in Google Maps. Now, Google Earth is getting a "time travel" interface where you can see historical Street View images from almost any location.

To mark its 20th anniversary, Google is also introducing a look back in time in Google Earth. This allows history to be viewed from a different perspective.

Google Earth is celebrating its 20th anniversary with an interesting new feature: the ability to time travel through your favorite spots with Street View. Google Earth added historical aerial imagery last year.