Perched on a rocky spur overlooking the village of Porto Venere, Doria Castle is a pentagonal‑shaped building. Externally, it features bastions facing the sea, a circular tower, an entrance portal once accessible via a drawbridge (no longer present), guard structures, and patrol walkways.
https://www.initaly.it/en/articolo/castello-doria-uno-dei-luoghi-pi-suggestivi-della-liguria-2965