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Easily accessible from the stations of Cristoforo Colombo or Castelfusano, and the suburb of Infernetto.
Castelfusano is an urban park in the comune of Rome. It divides the sea quarter of Ostia and the neighborhood of Casalpalocco. The castle and the park were founded in the 17th century by the Sacchetti family. Its vegetation consists mainly in a forest of colossal Maritime Pines and olm oaks. In the 18th century, the Sacchetti sold the property to the Chigi, who sold it in 1933 to the commune of Rome. In the park is still visible a stretch of the ancient Via Severiana. The park's vegetation was largely destroyed by arson in July 2000.
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This is close to Ostia Antica, on the other side of the railway line and Via del Mare in the small village of Ostia Antica. It was built in 1483 by Giuliano della Rovere, who later became Pope Julius II. Much of the building material consisted of bricks pilfered from Ostia Antica.
Parco Archeologico di Ostia Antica
This is a modern development and has berths for up to 794 boats, from 8m to 53m in length. Shops catering to yachties, restaurants and bars. A popular place among Romans for a weekend stroll.
Although Rome's original harbour was at Ostia Antica, but in the Imperial period two harbour basins were added to the north. Around AD 46 the Emperor Claudius constructed a new harbour with two long curving moles projecting into the sea. The harbour opened directly to the sea to the north-west protecting it from the prevailing south-west wind. It connected with the River Tiber by a channel on the south-east. The harbour was known as Portus (Latin for "harbour") and the Via Portuensis still connects Rome with the area. In 103 AD Trajan constructed another harbour farther inland, a hexagonal basin. The basin itself is now a reedy lagoon and remains of the many warehouses can still be seen. Like many points of archaeological interest in the area the port is unfortunately not open to the public without making an appointment. Details at itnw.roma.it/ostia/scavi/showfaq.php?fldAuto=1 .