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Pictured is Detail of the entrance to Palazzo Saint Callisto in the Piazza Saint Maria in Travestere, Rome, Italy. Today it is an extraterritorial property of the Holy See. The Palazzo San Callisto was named in honour of Pope Callixtus I and is now home to a number of Catholic organisations that are part of or directly linked to the Holy See. In 1990, the Palazzo was placed on the UNESCO World Heritage Register.