A route, not a reel
After a trip your phone is full of beach shots, a harbor, a rooftop view, none of it in the order it happened. The travel recap template gives that mix a structure: a named cover, stamp-framed photo slides and a closing page, so the carousel reads like a trip rather than an unsorted dump.
An ending, not a fade-out
Most photo dumps just stop when the photos run out. The postcard-back slide, with its postmark graphic and postcard lines, gives the story a deliberate last page so the carousel doesn’t just trail off after the final photo.