The fortification of Palmanova has a unique structure as it offers the visitor an insight into the innovations that the science of fortification has thought up over the centuries.
The Venetians built here low, wide embankments needed to defend the town by the artillery in the late XVI century.
Architects designed the walls in the shape of an arrow head, at the farthest point of each there was a rampart that was linked to the others by curtains.
This resulted in an enneagon – at its vertexes the ramparts came out in such a way as to defend each other.
The whole circuit was protected by a wide moat and the three entrances or openings to the town were made at the centre of three of the curtains.