The town was founded by the Saracens in the 9th century. A popular tourist destination today, there is a well-preserved old quarter with mediaeval streets and the Sangallo Fort constructed in the 1500s. For plant-lovers, the Villa Borghese has extensive gardens.
The Nettuno American Cemetery and Memorial is the burial site for almost eight thousand American soldiers who died in the battle following the Allied landing at Nettuno and the neighbouring city of Anzio.