Castello di Giulio II
Looming over the medieval borgo of Ostia Antica village, the pentagonal Castello di Giulio II was built between 1483 and 1486 for Cardinal Giuliano della Rovere — the future Pope Julius II, the man who commissioned Michelangelo's Sistine Chapel ceiling. It's a masterpiece of early Renaissance military architecture that almost nobody visits.
Architecture and Frescoes
The castle's circular corner towers and sloping earthwork bastions represent a pivotal moment in fortress design, built specifically to absorb cannon fire — a radical innovation at the time. Walking the ramparts, you look out over the Tiber mouth and the pineta (pine forest) stretching toward the sea, a view that has changed remarkably little since the 16th century.
Inside, the Sala della Rocca retains fragments of Renaissance frescoes commissioned by della Rovere himself, depicting hunting scenes and classical motifs. The painted ceilings are faded but legible, and the contrast with the brutal military stonework outside is quietly thrilling.
The Medieval Borgo
The castle anchors a small medieval borgo — a cluster of ochre-washed houses, a Romanesque church (Santa Aurea), and a handful of trattorias — that most visitors to the archaeological park never notice. Spend 30 minutes wandering its single main street and you'll feel like you've stumbled into a film set.
The church of Santa Aurea contains the tomb of the early Christian martyr Aurea and a fragment of Monica, mother of Saint Augustine — a relic that draws a quiet trickle of pilgrims who seem faintly surprised to find themselves here.
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