If you visit Pompeii, you find the ruins of a sophisticated town, with a number of seaside villas depicting a luxurious lifestyle. If you visit the Ostia, on the mouth of the River Tiber, you will find buildings which are impressive in quite a different way. This was once a successful commercial port with warehouses, shops and offices, as well as the usual urban amenities: bath complexes, public latrine, temples and so on. It is well worth a visit.
The Decumanus Maximus, the well-preserved main street in Ostia Antica