Station days were days of fasting in the early Christian Church, associated with a procession to certain prescribed churches in Rome, where the Mass and Vespers would be celebrated to mark important days of the liturgical year. Although other cities also had similar practices, and the fasting is no longer prescribed, the Roman churches associated with the various station days are still the object of pilgrimage and ritual, especially in the season of Lent.
Gregory the Great set the classic order of churches for the Lenten station days in the sixth century. (The Procession of Saint Gregory to the Castle Sant'Angelo, c. 1465.)
Popes since John XXIII have revived the practice of visiting the station for Ash Wednesday, Santa Sabina all'Aventino.
San Giorgio in Velabro is a church in Rome, Italy, dedicated to St. George.
San Giorgio in Velabro
Interior of San Giorgio.