Answer:
What building has the most stories?
A circle of stones, never in rows. Stacked one on the other, mystery it sows. What is it?
I am free for the taking. Through all of your life, though given but once at birth. I am less than nothing in weight, but will fell the strongest of you if held.
Come up and let us go. Go down and here we stay.
When I'm born I fly. When I'm alive I lay. When I'm dead I run.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.