"Avice's Cottage":

This stone cottage is identified as the model for Avice Caro's home: "a roomy cottage or homestead. Like the island it was all of stone, not only in walls but in window-frames, roof, chimneys, fence, stile, pigsty, and stable, almost door." (I,i)

"Pennylvania Castle":

This building is the model for "Sylvania Castle," the "dignified manor-house in a nook by the cliffs, with modern castellations and battlements." It is characterized by its trees, "which on this island of treeless rock lent a unique character to the enclosure." (II, vi)