I'm reasonably sure my house, built in 1977, does not have one of these.
https://www.messynessychic.com/2021/03/24/another-reason-to-check-your-attic-priest-holes/
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Cool, priest holes. My house doesn’t have one either but I just discovered that one of my ancestors was a secret Catholic during the reign of Elizabeth and was discovered hiding a priest. His titles were taken away and he was executed.