Answer:
I build up castles. I tear down mountains. I make some men blind. I help others to see.
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. I have greatest power when given away, yet lust for me keeps me locked away.
What is round as a dishpan, deep as a tub, and still the oceans couldn't fill it up?
What has a big mouth, yet never speaks?
When the day after tomorrow is yesterday. Today will be as far from Wednesday. As today was from Wednesday. When the day before yesterday was tomorrow. What is the day after this day?
I have two eyes in the front and a lot of eyes on my tail