You could always batch make visible/invisible when mass editing photo albums on Google+, but as far as I'm aware, you couldn't manually add and edit the geotagging data. Thankfully, a recent update changes this, adding a handy tool for those who'd like to do show off where they took that special holiday snap.
+Andrew Lee, who is a software engineer on the Google+ Photos team, announced the update in his post, where he explains how to access the new feature.
|Look for the new tool under Photo Details in the lightbox|
When clicking on edit, a big map is displayed on the screen, with a search box on top for quickly searching and adding the location. You can then click on the red placemark on the map and drop it anywhere (it's up to you how specific you'd like the location to be). Once you're done, hit save.
Will you be making use of the new feature?