I can travel from there to here by disappearing, and here to there by reappearing.

Answer: T

More Difficult Riddles with answers

More Difficult Riddles

I climb higher when hot, But beware my rage, I’ll kill with a breath, If I can escape my cage
I count time, but have no end. Tick tick, but I am not a clock. What am I?
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty.
I fly through the air on small feathered wings, seeking out life and destroying all things.
I follow the orders of only two. I respect the work of only two. I am in constant battles with many, Though one surpassed them all. With forces joined, We created hell, Until our mutual enemy fell. Who am I?
I grow for a surface, even if you cut me. I continue to grow even after death.
I grow where no flower grows, where no light touches the walls, up or down, that I don't care, was here before people were.
I have a title and many pages I am a genteel of genteel descent I am a killer veteran of war I am a slave to my lord Pledged to his service.
I have a tongue, but do not talk. I follow close, but neither run nor walk. Coupled and hitched, but never married. You couldn't bear the load I've carried.
I have an eye but cannot see, You'll head inside when you see me.
I have five letters and people eat me. When you remove my first letter I become a crime. Remove my first two letters and I am an animal. If you remove my first and last letters I'm a form of music
I have legs but never walk, I may have flowers but no soil, I hold food but never eat.