Our Photos shows a set of "photo galleries." 

To view the photos in a gallery, click on the thumbnail photo shown with the gallery.

Once you see the gallery, click on any photo in the gallery to start a slide show of the photos in that gallery.  You can pause, quit, or go to the next or prior photo in a gallery using the buttons you will see on the slide show.  When you click on next or prior buttons, the slide show will also pause the slide show until you press play.