The Archaeological Park of Ostia Antica together with Pompeii is the largest archaeological site on the planet with an area of 150 hectares and only 40 percent have been unearthed and more than half of the city is still buried. The site, which was originally located on the coast, is now three km away from the sea due to the debris deposited by the Tiber river over the course of two thousand years. The ancient city, which according to tradition was founded by King Anco Marzio around 620 BC, is located about 20 km from Rome to which it is connected by the Via Ostiense. Ostia Antica, represented for Rome the main and closest outlet on the Tyrrhenian Sea, was therefore a commercial and port center of strategic importance for the development of the city. Visiting the ruins of this ancient Roman city is like taking a dip in the everyday life of the past; in fact there are not only monuments, but also houses, productive and commercial structures.