Answer:
Sometimes black, sometimes white, I have veins but no blood
Upon me you can tread, though softly under cover. And I will take you places, that you have yet to discover. I'm high, and I'm low, though flat in the middle. And though a joy to the children, adults think of me little.
Alive without breath, As cold as death, Clad in mail never clinking, Never thirsty, ever drinking
What is a five-letter word that has brain in it?
You saw me where I never was and where I could not be. And yet within that very place, my face you often see.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.