My pick would have to be the A Whole Nother Story trilogy, in which (spoiler warning) you can only travel back in time. But because time is in a loop of sorts, if you go before the beginning of time, you will be at the end of time. From there you can go back to any time you want to. And time paradoxes cannot be produced. Plus, your memories from the previous timeline exist as well as the memories from the new one.
JERUSALEM by Alan Moore
All of time already happened once and everything is predestined and time is a solid. But that’s for humans when they’re alive, who have been blessed/cursed with the ability to only see/move in “the special direction”. When you die, and ascend to the accretion of human existence that is the Ghostlands - between life and heaven - you can “tunnel” into the past (or the Ghostworld’s accretion of same) and, as two characters do, you can “walk” forward as far as the end of all time (but it will take you awhile)