Irish priests revive “Mass Rocks” from days of anti-Catholic persecutionThese altars made of boulders were once the secret worship places of Catholics, when the practice of their faith was prohibited.As part of a campaign organized by Aid to the Church in Need (ACN), Catholic priests are celebrating Mass at a “Mass Rock,” where the Irish faithful once secretly practiced their faith when it was illegal to do so.Mass Rocks, the clandestine churches of an age of persecutionIn the 16th-18th centuries, during the period of the “Penal Laws” enforced by England, any public expression of the Catholic faith in Ireland was...