GGG Ping.
What with the weather and terrain of the Orkney's, it may be that they built underground structures to take advantage of the berm-effect - much easier to heat and to maintain that heat. It may simply be that they liked to keep from freezing to death.
But that would be too simple - first, the archaeologists and historians have to ascribe all sorts of mysterious possibilities -
Cooooooooooooolll...
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Went to the Orkneys on my first command, 90,000 ton tanker to pick up a load of North Sea crude oil. The currents leaving there were of legend. Full powered ships spun around like toys.
View of Callanish (I), Lewis, looking along the ridge and up the avenue
http://www.orkneydigs.org.uk/dhl/papers/cr/index.html
Very interesting as my ancestors came from this area and John o’ Groats.
Google up Ocmulgee National Monument if you would like to see an ancient Indian structure that sounds identical to this souterrain. I wonder if the narrow entrance faces the Spring Equinox? Very curious.
regarding the picts, the oddest issue the that their language, aside from some placenames and a king-list, has apparently vanished. It is widely suspected to have been a P-celtic variant (there is a contrary published argument that it is finno-ugric, but no other scholarship seems to agree with that).
Even the primary place-name market (pit, pith, which appears in a number of towns in central-eastern scotland) could be the normal b-p mutation in p-celtic bet (modern welsh bedd pronounced ‘beth’ IIRC) which meant thing or place, i don’t recall now.
Maybe all of britain, up to cape wrath, was settled by P-celts prior to the roman period, and the picts were just so isolated and far north geographically that they either had notable language mutation OR for other reasons were considered separate from more southern tribes.
If they were in fact p-celts from similar stock to other pre-roman british celts, they aren’t going to leave any distinct markers I would think.