The Palazzo San Callisto (also known as the Palace of Saint Callixtus) is a small palace in Rome and one of the extraterritorial Properties of the Holy See

Properties of the Holy See

The properties of the Holy See are properties of the Holy See which are regulated by the 1929 Lateran Treaty signed with the Kingdom of Italy. Although being part of Italian territory, all of them have an extraterritorial status, similar to those of foreign embassies.- Outside Vatican City but...

. The Palazzo is located in the Piazza di San Callisto, one of the areas of the Holy See regulated by the 1929 Lateran Treaty signed with the Kingdom of Italy. As such it has extraterritorial status.

The Palazzo San Callisto was named in honour of Pope Callixtus I

Pope Callixtus I

Pope Saint Callixtus I or Callistus I was pope from about 217 to about 222, during the reigns of the Roman Emperors Elagabalus and Alexander Severus...

 and is now home to:

• The Pontifical Council Cor Unum
  Pontifical Council Cor Unum
  The Pontifical Council Cor Unum for Human and Christian Development is a part of the Curia of the Catholic Church. It was established by Pope Paul VI on 15 July 1971 and is based in the Palazzo San Callisto, in Piazza San Callisto, Rome....
  
  
• The Pontifical Council for the Family
  Pontifical Council for the Family
  The Pontifical Council for the Family is part of the Curia of the Roman Catholic Church. It was established by Pope John Paul II on 9 May 1981 with his motu proprio Familia a Deo Instituta, replacing the Committee for the Family that Pope Paul VI had established in 1973...
  
  
• The International Catholic Charismatic Renewal Services.

In 1990, the Palazzo was placed on the UNESCO

UNESCO

The United Nations Educational, Scientific and Cultural Organization is a specialized agency of the United Nations...

World Heritage Register
.