Answer:
I'm written with two letters, said with one and seen with two. What am I?
So cold damp and dark I am. To stay you would refrain yet those who occupy me do never complain.
Brown I am and much admired. Many horses have I tried. Tire a horse and worry a man, tell me this riddle if you can. What am I?
What room do ghosts avoid?
I fly when I'm on and float coming off.
What age most travelers have?