Images are from the Scottish Crannog Center in Kenmore, Loch Tay, Perthshire, Scotland, a museum of crannogs, “an ancient loch-dwelling found throughout Scotland and Ireland dating from 5,000 years ago. Many crannogs were built out in the water as defensive homesteads and represented symbols of power and wealth”.
The interior of the cabin has a raised bed for sleeping, it’s possible that animals had a sleeping place directly underneath, for added warmth. Bracken was used to insulate the sides of the crannog from wind. There was a central fire pit, but no chimney — an Iron Age visitor (Tacitus?) remarks about his visits to Celtic lands that their dwellings were extremely smoke-filled, and initially took some getting used to (but that the locals were quite used to it and didn’t notice)!
The last two images are reconstructions of log boats that were found around the crannog archaelogical dig site.