Answer:
What relies on columns but isn't a house, and asks for help but can't speak itself?
The more holes you cover the lower it goes.
What has a bottom right at the top?
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.
As a whole, I am both safe and secure. Behead me, I become a place of meeting. Behead me again, I am the partner of ready. Restore me, I become the domain of beasts.
What goes up the hill and down the hill, And spite of all, yet stand still?