Significant locations history

It is not possible to access all tracks in Significant Locations, only the 2 most recent ones.

You can find Significant Locations here:

Settings > Privacy & Security > Location Services > System Services > then tap Significant Locations.

Significant Locations is designed to save locations you have visited in order to provide information later, for example with navigation, or suggestions for when you should drive from home, to reach an appointment, etc. Significant Locations is NOT intended as a kind of "Back Track" function where you can see all the places you have stayed. It has been possible before in previous iOS versions, but has probably been changed, due to privacy.