Answer:
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
Canine children.
Golden treasure I contain guarded by hundreds and thousands. Stored in a labyrinth where no man walks Yet men come often to seize my gold. By smoke I am overcome and robbed then left to build my treasure anew.
I was not born but I am here. I have no name but I am given many. I was made by science and life
I am a lunch money thief
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.