HG Wells' Time Traveler sees his environment accelerated forward or backwards. Some time travelers see nothing. A philosophical article on "Doctor Who And The Philosophers" argued that, if a time machine travels from London, 2000 AD, to Manchester, 1900 AD, then the visible, tangible vehicle should be seen moving slowly south throughout the twentieth century.
Alan Moore's Dead Dead Gang in Jerusalem (London, 2016) walk along a bridge from which they see that:
"...several different eras were all happening at once.'" (p. 618)
Structures crumble, vanish and reappear and historical periods are superimposed.
"...the sky was marbled with the light and weather of a thousand years..." (p. 619)