Answer:
A blind man enters a maze, and the entrance closes behind him. His only way out is to solve the maze. A long time passes, and he exits the maze through the correct exit. How did he solve the maze?
I sleep by day, I fly by night. I have no feathers to aid my flight.
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.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.
What goes around and around the wood, but never goes into the wood?
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.