Pentecost was the decisive moment when the Church was given the power to carry out the task of spreading the Good News.
Pentecost – What is it all about: The Catholic Encyclopedia Explains
The BBC has a nice summary of facts about this day
Pentecost has origins in a Jewish festival named Shavout. Find out information on Shavout here.
The catacombs are the ancient underground cemeteries, used by the Christians.
The term Catacomb comes from the latin for the word dormatory stressing that for Christians burial was not an indication of the end of life but the beginning of new life.
Information about the place of the Catacombs in the life of the early Church.
The Christian Catacombs of Rome. This site provides very good information on the most well known Catacombs just outside Rome.