Answer:
Thousands lay up gold within this house. But no man made it. Spears past counting guard this house, but no man wards it.
He has one and a person has two. A citizen has three. And a human being has four. A personality has five. And an inhabitant of earth has six.
Iron on a mammal. Mammal on your feet.
Long legs, crooked thighs, little head, and no eyes.
A little pool with two layers of wall around it. One white and soft and the other dark and hard. Amidst a light brown grassy lawn with an outline of a green grass.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.