Answer:
I climb higher as I get hotter. I can never escape from my crystal cage.
So simple, that I can only point. Yet I guide men all over the world.
I go around a yard but does not move.
Though desert men once called me God today men call me mad. For I wag my tail when I am angry. And growl when I am glad.
I build up castles. I tear down mountains. I make some men blind, but I help others to see. What am I?
Before Google, we actually had to physically look things up in this building full of knowledge.