Answer:
This only turns over once you have traveled very far. What is it?
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 grow where no flower grows, where no light touches the walls, up or down, that I don't care, was here before people were.
I build up castles. I tear down mountains. I make some men blind. I help others to see.
Thousands lay up gold within this house, But no man made it. Spears past counting guard this house, But no man wards it.
People take me on walks and I run and have fun. What am I?