How can I show geolocation of one specific photo on a map in iOS?
In iOS 12 fsb’s answer doesn’t seem to work any more. A different way is via Apple’s Shortcut app. In the gallery you can find a shortcut named “Where was this taken?”. If you add this and let the actions show up in the share sheet. Then you will be taken to the location by:


Select the photo
Press the “share” icon
Select “Shortcuts”
Select “Where was this taken?”
Done, you should now see the map app and the location of your photo