Palazzo San Callisto

Palazzo San Callisto is a Baroque building located in Rome's Trastevere neighborhood, situated near the church of Santa Maria in Trastevere. Its facade displays symmetrical proportions with multiple windows and ornamental details typical of Baroque architecture.

The palazzo was named after Pope Callixtus I and became an extraterritorial property of the Holy See in 1929 through the Lateran Treaty. This agreement established its special legal status independent from Italian sovereignty.

The building functions as an administrative center for the Catholic Church, housing papal councils that operate daily. This role makes it a place where important church decisions are made and discussed.

The building is not readily open to casual visitors since it functions as an active church administration center. You can view the Baroque facade from the street or learn more about the site's history through nearby museums and informational resources.

A historical well inside the palazzo grounds marks where Pope Callixtus I is believed to have died as a martyr in the 300s. This well connects the building's current church administration role to the earliest centuries of Catholic history.