Future
--------/ ### H ### D
-------/ #### E ### R
------/ ##### R ### A
Now ###### E ### G
------\ ###### # ### O
-------\ ###### B ### N
--------\ ###### E ### S
Past
You can follow an observer and note what they're doing from the past as they move along to the future, you could follow an observer as they wonder how they shoomped some great distance across the universe into dragonland.
If you're massive and traveling along the diagonals between "timeland" and "dragonland" then you're by definition moving at the speed of light, have infinite inertial mass, and infinite time dilation: no witty journal quips are going to come out of the universe-brightening wreckage when you hit something, you wouldn't be able to measure time between hitting c and hitting whatever poor planetary system you obliterate.
Applying
that to what a photon would experience is... weird, since the whole "infinite time dilation" thing kicks in due to the specification of a massive observer moving at c.
A body without rest mass at c doesn't quite fit the same "what would x experience" framework, if you want to go down a series of fun rabbit holes along that hypothetical sheaf though, you could do worse than follow Wheeler and Feynman and wonder if
an electron experiences itself jumping back and forth through time, interacting with itself in a gigantic fustercluck? Probably not, but it is a neat thought experiment!