Fun fact: one of my books says time doesn't exist and is just a concept made up by humans to make everything easier. So how would I move inside somewhere or something when it doesn't exist.
Another one I read briefly mentioned a theory of time not flowing like a river, but being more of a frozen lake with us moving in the ice. And everything that happened is frozen in it. Still existing, just inaccesible to us. Also there are time bubbles where nothing is dead nor alive, nothing ages or withers away with time, but still can be influenced if something from normal time flow gets in there. Though usually those bubbles are too small to do anything with them, but some are big enough that with certain maneuvers you can get there and it'll be a whole mini world to live in. Strange things happen there though.