Ostia Antica
Rome's forgotten port city, buried and brilliantly preserved for 2,000 years.
Ostia Antica was ancient Rome's main harbor city — a bustling commercial hub of roughly 50,000 people that handled the grain, oil, and goods that fed the empire. When the port silted up and the city was gradually abandoned in late antiquity, it was buried under layers of earth that protected it remarkably well. What you get today is an enormous archaeological site that gives you something Pompeii famously delivers but with far fewer crowds: an entire Roman city you can walk through at your own pace, with streets, temples, bathhouses, apartments, taverns, and warehouses all still standing to considerable height.
The scale of the place is what hits you first. You arrive through the Porta Romana and walk the Decumanus Maximus — the main street — for nearly a kilometer, past mosaic-floored guild buildings, the well-preserved theater that still hosts summer performances, the Forum of the Corporations with its stunning black-and-white mosaic floors, and the public latrines that always get a reaction. The Terme di Nettuno has some of the finest Roman mosaics you'll see anywhere, depicting Neptune driving his sea-horses. There's also a full apartment block (the Insula of Diana), temples, a synagogue that's one of the oldest in the Western world, and a small but excellent on-site museum.
Ostia is a 30-minute train ride from Rome on the Roma–Lido line from Porta San Paolo (next to Piramide metro station), which makes it an easy day trip. The site is genuinely large — budget at least three hours, more if you're a history enthusiast — and the paths are largely unpaved, so comfortable shoes are essential. Because it sits in Mussolini-era drained marshland, it can be surprisingly hot and buggy in summer. Go on a weekday if you can; even in peak season it's quieter than you'd expect, which is precisely the point.
