Porta Senese (XV sec.)

Porta Senese is a 15th-century gateway that once marked the entrance to Porto Ercole during Sienese rule, and it's one of the best-preserved reminders of the town's layered medieval and Renaissance past. Walking through it feels like stepping into a different era, with the worn stone arch framing the steep lanes and terracotta rooftops above the harbor. It's a small but genuinely historic detail that most people just walk past — worth a pause and a photo.