There is considerable Greek influence in the construction of the Basilica, the most important public building in Pompeii. It served as a courthouse and chamber of commerce. I've always been fascinated by the huge brick columns here. Originally covered with plaster and painted, they were simply imitations of fluted, solid marble columns. The rows of columns divide this building into 3 naves.
The Roman basilica became the architectural pattern from which early church buildings were built. Many cathedrals are called basilicas even in modern times.