The Roman Church is an important part of the Catholic faith and is known for its grand basilicas. A BASILICA is a large and impressive public building, typically a church, that is used for Christian worship. The term 'BASILICA' is derived from the Greek word for 'royal house' and was originally used to describe a Roman public building. The most famous example of a BASILICA is St. Peter's BASILICA in Rome, which is the largest church in the world.