They are there, just for one second or for awhile.
When you turn your back to iwhat you see, you forget all about it at once, even if it’s the thrusted vieuw of the street where you live. You forget the details in the photo too, although everything which is there, is completely unique: these things will never come back in exactly the way they are when you made the photo.
IMHO this is somewhat different from the photos you make in say Fukushima or Tsjernobyl; their uniqueness makes them stick in your mind”s eye for a long time. Still, even in the no-go zones time is changing slowly but steadily. Each second is special.
One millisecond ago the Oval Office and the Kremlin were totally different places.