Why did people from such different parts of the world build the pyramids?

      
                                 Why did people from such different parts of the world build the pyramids?
                                                            Why was it so important to them?
                                                             Why are these constructions similar?
                                
                                                     http://www.photo-travels.org/collection/3/

BOROBUDUR

 Borobudur is a Buddhist monument in Magelang (Indonesia). There aren't inner spaces seen in other temples, and they are with a general design similar to the shape of pyramid.