Pope Leo's Buenos Aires Mass was the 4th largest Mass in history.
1. Francis, Manila, 2015 - 6-7 million
2. John Paul II, Manila, 1995 - 4-5 million
3. Francis, Río de Janeiro, 2013 - 3.2 million
4. Leo, Buenos Aires, 2026 - 2.5 million
5. JPII, Krakow, 1979 - 2 million