Looming over the pocket-sized borgo (village), Ostia's formidable castle was buillt by Pope Giulio II at the end of the 15th century to guard the mouth of the Tiber. It was eventually abandoned in 1557 after flooding caused the river's course to change. Inside, you can admire displays of ceramics made in the borgo and walk around the battlements on the castle keep.
Castello di Giulio II
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