007 Italy - Rome - Ostia Antica Caseggiato di Diana (c. 150 AD) House of Diana Once a five story building with shops on the first floor and residences above. The first floor had 17 rooms and 4 stairways. The building had a courtyard, fountain, many paintings, mosaics and patterned stone floors. Some believe that the missing upper stories did not collapse but were carefully removed to salavage the brick.