UK server, OK. Fine. But OP has never been to Pennsylvania in the US. Most houses over a hundred years old look like this: you can see the generations that have lived in it. First it's stone and mortar; then there's a wood addition ca. the early 1900s; then there's a more modern addition ca. the 50's or later. There's one property that was briefly famous as it came up in Zillow that had 5 clearly distinctive styles and technologies worth of additions on it; it's like every generation added another room with whatever was in style at the time. I can't find a picture, but it was hideous.
I don't know if it's common all along the mid-Atlantic, but it is super common in Pennsylvania.