Answer:
Inside a great blue castle lives a shy young maid. She blushes in the morning and comes not out at night.
It's got twists and turns, but has no curves. Twist it to fix it, turn it to ruin it. What is it?
What asks but never answers?
What can you catch but not throw?
Crooked as a rainbow, and slick as a plate, Ten thousand horses can't pull it straight.
Bury deep, Pile on stones, My mind will always Dig up them bones