St Nicholas’s (Anglican) church in Carrickfergus dates back to the 1100s, prior to the castle. The low window shown above is known as the “leper window”. Patients from the leper hospital near the (northern) Spittal Gate to the city would come and listen in (Library Ireland). During the coronavirus pandemic of 2020, services are not even being held.
A virtual tour of the church is available in the church’s web site.
Recently in Carrickfergus: The Plague Grave. Covid-19 church-related posts from Belfast: Rediscovr The Powr Of Th Rosary | Prayer In The Time Of Coronavirus
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Extramural Activity 
I can correct you there. Services have been ongoing right throughout the pandemic. They have been online each week. Everyone welcome, no leper window required….