Last day in Rome, Italy

This is our last day in Rome. We were planning to go to visit a castle today, but we ran into a big celebration with thousands of people.  I believe they were celebrating the Immaculate Conception. We ended up walking around Rome, saw the castle and some other interesting sights  and ended up at Vatican City again. When we returned home, they were having a big celebration on the streets below our apartment. The streets are all blocked off and crowds of people parading down the street singing and praying.