 Later <unk> date from the Roman <unk> and include a <unk> road lined with shops . Of the large marble columns bordering the Roman street only fragments and bases remain . The Romans also built a monumental staircase adorned with mosaic patterns that leads to the top of the podium . To the right of the Roman road , near the entrance of the site stands a nymphaeum with niches where statues of the nymphs once stood . The floor of the nymphaeum is covered by a mosaic depicting the <unk> . Across the <unk> road , facing the nymphaeum , are the ruins of a Roman villa ; only the villa 's courtyard has survived along with the remains of a mosaic depicting the four seasons . To the right of the processional Roman staircase stands a cubic altar , also of Roman construction . Other Roman period structures include two columns of a great portico leading to pools and other <unk> installations . 
