I'm looking at my Google data for the last years to see where I've been.
My time spent on a working holiday in Australia.
My most visited areas are in the east coast of Canada.
Seems like most of the places have been captured by Google but not all of them. Definitely been to California, Hawaii, and Las Vegas none of which show up here.
I took a trip to Amsterdam in Europe which doesn't show up either.
Also took a bus across Canada after high-school and nowhere from that trip shows up.
I think what all those places have in common is that I wasn't using an Android phone when I went.
You can get your data at: https://www.google.com/maps/timeline?pb