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Lemgare Mass Rock, County Monaghan, Ireland

Scattered across the Irish countryside are enormous rocks that were used to celebrate Mass during the times of the Penal Laws, when it was illegal to be Catholic in public.
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Mass rock in the foothills of Slievenamon, County Tipperary, Ireland

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A mass rock with a statue of the Blessed Virgin in the Crockauns Mountains

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Glen Mass Rock, Garrison, Northern Ireland

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Glenville Mass Rock, County Cork, Ireland

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The Burrenreagh Mass Rock, Northern Ireland

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Mass Rock, Doagh, County Antrim, Northern Ireland