As a teen I loved watching Twilight Zone. I loved the mind-bending weirdness of it. But I will admit that these days I am more interested in time travel books as a way of making historical fiction more palatable. Somehow, I often find it more interesting to read about a character going back in time to a certain period, rather than reading a story set in that period. When a kid in a book travels back in time you get to see them compare present time to the era they are visiting which is fun! So, I am more drawn to stories that teach me history, or that have characters I can really care about, rather than stories that have a lot of science-fiction-y details about the time travel transportation itself.
Why Time Travel?