The Watch Tower

Different views 

This tower dates from the 13th century. 


The openings are gun loops as opposed to arrow loops.
Its arrow loops were replaced in the 15th 16th century to facilitate artillery. 

At the back of the tower you can see two entrances, one at ground level and the 2nd at wall walk level. 

The absence of two windows on the inner elevation of the tower suggests that it functioned exclusively as a defensive structure and was not intended to be occupied as a residence during peace.