Basilica
Some basilicas are famous because they have "relics" (or bones or perhaps a body part) of a saint. It could also be the case that the relics were reinterred from the original place.  If a church housed the body of an important saint, then many people would come on pilgrimage and would dedicate themselves to prayer and the use of the sacraments. Basilicas that have bodies include St. Mark's, Venice, St. Nicholas of Bari, also in Italy, and the Basilica of St. Mary Magdalene in Vezelay, France. Not all relics are bodies. Basilicas may also hold a famous object like a piece of the True Cross, or the belt worn by the Virgin Mary. People often ask whether all these precious relics are authentic. The Roman Catholic Church does not get into arguments about trying to prove whether the pieces of the Cross, the body parts and other things are real. Sometimes the relic is known to be real. Sometimes there is no way to prove it, either way.