What can be inferred about Mesopotamian societies from the complex building structures like the ziggurat?

I believe the answer is: Ancient Mesopotamians utilized advanced technologies and planning in architectural construction.

Ancient Mesopotamian people believe that the craft in building can be used as a divine gift given to humans by the gods. This belief lead to many techniques and technology in their architectures which considered to be really advanced at that time. Their architectural blueprint was adopted by many other societies after them.