House of the Opus Craticium (Casa a Graticcio) (Herculaneum)

House of the Opus Craticium or Casa a Graticcio is famous for its ingenious building technology. It consists of a wooden frame filled by stones. Apparently it was a very cheap and effective way to erect residences for middle and lower class citizens of Herculaneum. This residence is the best preserved example of such structure. It was inhabited by several families who lived together in this Ancient Roman apartment building.