Basilicas are Catholic church buildings that have a designation, conferring special privileges, given by the Pope. Basilicas are distinguished for ceremonial purposes from other churches. The building need not be a basilica in the architectural sense (a rectangular building with a central nave flanked by two or more longitudinal aisles). Basilicas are either major basilicas, of which there are four, all in the Diocese of Rome, or minor basilicas, of which there were 1,924 worldwide as of 2023.
Numerous basilicas are notable shrines, often receiving pilgrimages, especially among the many that were built above a confessio or the burial place of a martyr; although this term now usually designates a space before the high altar that is sunk lower than the main floor level (as in the case in St. Peter's and St. John Lateran in Rome) and that offer more immediate access to the burial places below. Some basilicas are Christian pilgrimage sites, receiving tens of millions of visitors per year.
