Open thread- questions for civ tech tree

Lets keep it on topic!! Thanks or i will get it removed. When this thread gets super long just pay attention to the last question asked- feel free to ask your own questions relating to civs tech trees, but when responding always hit reply to who u are responding so the person can see the answer is to there questions.

Im curious what civ has the most defensive buildings (buildings that auto shoot with/without occupants) of coarse not considering the town center, tower and keep-age 3, that every civ has. For instance the english has one or two age upgrade buildings that act as defensive structures. But even delhi sais its a military defensive structure but never shoots?! So anyone know which civ has the most defensive structures? And do u know how many?