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

Answer: The letter "T".

More Classic Riddles with answers

More Classic Riddles

I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs my help, yet many people are afraid to let me help them. Who am I?
I give you a group of three. One is sitting down, and will never get up. The second eats as much as is given to him, yet is always hungry. The third goes away and never returns. What are the three things?
I have four of these, With matching extremities. They can do many things, And hardly ever bring me pain. Unless I stick them with a pin, Or burn them sometimes when... What is it that I can wiggle at will? And use in other means still?
I have four wings, but cannot fly, I never laugh and never cry; On the same spot I'm always found, toiling away with little sound. What am I?
I have no voice and yet I speak to you, I tell of all things in the world that people do. I have leaves, but I am not a tree, I have pages, but I am not a bride or royalty. I have a spine and hinges, but I am not a man or a door, I have told you all, I cannot tell you more. What am I?
I have two arms, but fingers none. I have two feet, but cannot run. I carry well, but I have found I carry best with my feet OFF the ground. What am I?
I heard of an invading, vanquishing army sweeping across the land, liquid-quick; conquering everything, quelling resistance. With it came darkness, dimming the light. Humans hid in their houses, while outside spears pierced, shattering stone walls. Uncountable soldiers smashed into the ground, but each elicited life as he died; when the army had vanished, advancing northward, the land was green and growing, refreshed. What is it?
I look flat, but I am deep, Hidden realms I shelter. Lives I take, but food I offer. At times I am beautiful. I can be calm, angry and turbulent. I have no heart, but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?
I make you weak at the worst of all times. I keep you safe, I keep you fine. I make your hands sweat, and your heart grow cold, I visit the weak, but seldom the bold. What am I?
I move without wings, between silken strings, I leave as you find, my substance behind. What am I?
I never was, am always to be, No one ever saw me, nor ever will, And yet I am the confidence of all To live and breathe on this terrestrial ball. What am I?
I say everything I hear to others around. I'm not an animal, nor part of the human race. I will, immediately, repeat after you; But only if my tail is in place. What am I?