There's one saying what we know as mountains now were trees, cut down by 'them'. Nobody knows who "them" is - illuminati, Aliens, Tri-lateral world commission or whatever, God knows :)
This devil's tower thing was one of the 'cut down trees' presented in the documentary, because it does look like the stalk of a giant tree.
Ooh. You know, to be honest, I was hoping for something a little more realistic and with a good premise.. But hey, I guess I haven't done my research haha.