Add Location Data to Pictures in Photos so They Show in Places: Page 2 of 2
Adding the Location data so photos show up in Places and search
Now you'll have all the photos from the trip that are lacking location data in front of you. You can select all of them at once, or do it in batches (I first added our stopover locations, before selecting everything else from Japan). Once you've selected the photos to alter, simply go to Window > Info (⌘I) to open the Info panel, then under Assign a Location, start typing in the name of wherever you were.
Notice above that Photos was auto-suggesting based one what I'd typed so far (just “Tokyo,”), so be sure to pick something that makes sense. I was not being super specific with these photos, and I didn't care to try to add each batch in the actual location where they were taken, so I just assigned all 1,062 photos to “Tokyo, Japan”.
Now when I look at the map, I see all the photos there!
Of course when I zoom in, the only ones that are truly accurate are the iPhone photos, but I'm OK with that. At least these all show up in the right city now.
How quickly can you do this to your whole library?
By taking this general approach, it's conceivable that you could add location data to your entire library in a matter of hours. And once that's done, you'll really have something fun to look at. Or to ask your Mac for…