“Hermitage (religious retreat)” - Wikipedia
A hermitage most authentically refers to a place where a hermit lives in seclusion from the world, or a building or settlement where a person or a group of people lived religiously, in seclusion. Particularly as a name or part of the name of properties its meaning is often imprecise, harking to a distant period of local history, components of the building material, or recalling any former sanctuary or holy place. Secondary churches or establishments run from a monastery were often called "hermitages".
In the 18th century, some owners of English country houses adorned their gardens with a "hermitage", sometimes a Gothic ruin, but sometimes, as at Painshill Park, a romantic hut which a "hermit" was recruited to occupy. The so-called Ermita de San Pelayo y San Isidoro is the ruins of a Romanesque church of Ávila, Spain that ended up several hundred miles away, to feature in the Buen Retiro Park in Madrid.