Although many of the town's defensive structures have been incorporated into later buildings, the original town gates are still visibile.

The Porta Carrese in via della Torre del Nibbio still bears the coat of arms of the Caetani family of the 14th century when Sperlonga belonged to the Count of Fondi.

Also look out for the Torre Truglia built by the Spanish in the 16th century as a look out tower against the Turks. The tower rests on a circular Roman base, most possibly for a lighthouse.

All good things must come to an end and in 1534 Sperlonga was sacked by the infamous Kair-ad-Din, otherwise known as Redbeard. He devastated the town and deported the inhabitants.

In true legendary storytelling manner he also tried to kidnap the beautiful Countess Julia Gonzaga and offer her as a gift to Sultan Sulayman the First. Stand in Valle Corsari beside the grotto and imagine the whole scene.