OSXDaily:

Consider this feature to be Apple’s version of Google Maps Location History. Now, before you start worrying about your privacy, keep in mind that Apple doesn’t see or read this information, since all the data related to Significant Locations is encrypted. Plus, you have the option to remove these locations from your device and also turn this feature off, if you still have security concerns or you simply don’t want to share such information.

Significant Locations are enabled by default on iOS devices, but if you are reading this, you mighty want to turn it off and clear out that data. In this article, we’ll be discussing exactly how you can delete Significant Locations on both the iPhone and iPad.

Good to know you can delete your Significant Locations, but even if you don’t particularly care about that, worth following along just to explore this little-used branch of Settings.