OSTIA ANTICA, Italy The ruins of Ostia, an ancient Roman port, have never captured the public imagination in the same way as those of Pompeii, perhaps because Ostia met with a less cataclysmic fate.

Yet past archaeological digs here have yielded evidence of majestic public halls and even multistory apartment buildings that challenge Pompeii’s primacy. Now officials hope that the decade-long restoration of four dwellings lavishly decorated with frescoes will focus new attention on this once-bustling port about 15 miles west of Rome.

Last week the second-century insulae, or housing complexes, were presented to the public through the European Heritage Days program, in which each member country of the Council of Europe promotes new cultural assets and sites that have mainly been closed to the public.

“Over all, this is the most important ensemble of second- and third-century frescoes in the world,” Angelo Pellegrino, the director of excavations at the site, now called Ostia Antica, said in an interview.