Answer:
A great mysterious place that the bold have been known to journey into.
The ones who see it may go blind, Contracting the fool's madness. You have to dig to find it, Crush big stones or mine it. Wash dirt clumps in a pan and wait for it to settle, A shiny, precious metal.
Through its wounds, water does run. It once held many but now has none. What is it?
What is the freedom of birds and the pen of old men?
As destructive as life, As healing as death; An institutioner of strife, Just as prone to bless. It is all that is good, Yet with an evil trend; As it was the beginning of things, It can also be the end.
You use it between your head and your toes, the more it works the thinner it grows.