Try this. Next time you travel somewhere, don't take any photograph. Now, you are free to observe the big picture and the hidden details. Write down your observations later to substitute the memento that the picture would have represented.
Having a self narrated insight will serve multiple purposes. It will make it more memorable. It will serve as a source of ideas. Revisiting what you thought instead of what you saw will trigger more long-lasting lessons, emotions and insights. Moments are ephemeral. Pictures capture a frozen instant. A narration captures a longer time span of thoughts and emotions.