Still dry...amazing.
They had considerable skills to build this...wonder why there are not more or even villages and the like.
There probably were, but their modest remains either remain undiscovered, or they are under newer structures. Meath (Midh) was the smallest of the Five Fifths (Caig Caigi, something like that), and landlocked to boot. Presumably that was in deference to its ancient importance. Eventually its neighbors decided to split its territory and marched on in and pulverized it. If memory serves.
As a common practice, stone was reused, with old dwellings and walls taken apart to build new structures. An Irish stone cottage built only a hundred years ago may incorporate stones first used in habitations and walls built several thousand years ago.
Look at the Gallus Oratory for a smaller 12th c. look at dry stonework.
https://en.m.wikipedia.org/wiki/File:Gallarusoratory.jpg
