Just wondering

What is it that makes a story, any sotry, MFU or otherise, remarkable for you?

What does it really, really need to make you want to come back to it, to want to visit it, to make you seek out the actual place on Earth if it is set in real places?

What makes a story unforgettable and stick with you? Is it only characters you read for or does the rest of the story need to be as enticing as the characters?