Google photos started receiving Themed Memories a while ago and keep adding different collection types as it goes. These themed memories are based on a certain photos classification that Google Photos app performs on your library. As soon as it manages to classify enough amount of photos to a certain group, you'll see a dedicated Memories highlight.
One of the recent highlights is called "Out in the country" which aggregates photos from the country-side. Did you get this one already?
How to test?
- Check if you have Themed Memories enabled in Settings > Memories > Themed Memories checkbox.
- Keep an eye on Memories that appear on top of your Google Photos app from time to time.
- 📲 Google Photos is an official gallery app by Google that implements machine learning features.
- 📲 No public beta version is available for Google Photos app.