Answer:
It is worldwide, but once only a spider could weave one
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not
What has wings, but can not fly. Is enclosed, but can outside also lie. Can open itself up, or close itself away. Is the place of kings and queens and doggerel of every means. What is it upon which I stand? Which can lead us to different lands.
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.
I am round as a bowl, deep as a tub, but all the world's water couldn't fill me up.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.