Does the Darkness spell cast a shadow?

If you were outside during the day and you cast darkness above you somehow, would the darkness spell cast a shadow?

If you cast darkness in a tunnel, and the only source of light was from one end of the tunnel only, would the other side of the darkness spell remain illuminated or would it be plunged in shadow (non-magical darkness)?

The description of the darkness spell says that “light can’t illuminate”. I would therefore posit that it also does not pass through it either.