Two Doria-era fortifications survive from Sassello's medieval and early modern history. The Bastia Inferiore stands on a hilltop above the town and was built by the Doria family in the 14th century to control the Apennine pass below. The Bastia Superiore, closer to the town centre, dates from the 15th century and served as the main defensive stronghold.
Both structures are partially ruined but accessible. The views from the Bastia Inferiore over the surrounding wooded hills and the Liguria plain beyond are the main reward for the short climb. The fortifications give a sense of how strategically important this hill-town was before the modern road network made mountain passes less significant.