Model of Mesolithic house at Mount Sandel, Northern Ireland. By Notafly (Own work) [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons

Skara Brae late Neolithic stone built settlement on Orkney. John Burka [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], via Wikimedia Commons

Replica Bronze Age roundhouse at Flag Fen, Cambridgeshire. By Viv Hamilton at en.wikipedia [Public domain], from Wikimedia Commons

Iron Age broch at Glenelg, Scotland. By Wojsyl (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/) or CC-BY-SA-2.5 (http://creativecommons.org/licenses/by-sa/2.5)], via Wikimedia Commons

Replica Iron Age roundhouse at the Chiltern Open Air Museum.