Ostia Antica is Rome's ancient port city and one of the best-preserved Roman archaeological sites in the world. The site offers a less crowded experience than Pompeii with equal magnificence: cobblestone streets, baths, theaters, and houses with intact mosaics. The ancient theater seating 4,000 still hosts summer performances. Wander through remarkably preserved apartment buildings, taverns, and the Forum, all without the crowds of central Rome. A perfect half-day escape from the city.