Architecture, just like civilization started in prehistory. Even though the sites that survived many thousands of years are limited in number, they still help us have an understanding of the human-made structures of history. I’ve read some of the pages of the book A Global History of Architecture as a part of our assignment belonging to the History of Architecture class. Here is a very basic explanation of the parts about the first structures.
The main categorization of these structures can go as residential structures and ritual structures. Perhaps the most popular ritual structure is Stonehenge along with the mysterious site of Göbeklitepe. These structures are thought to have had a function of both religious rituals and astrological purposes. Still, the reason and the way they work are being discussed and hopefully figured out.