Kilbirnie Castle
... that Kilbirnie Castle in North Ayrshire includes a 15th-century keep with walls that are 7 to 8 feet (2.1–2.4 m) thick?
... that <b id="mwDT4"><a href="./Barony_and_Castle_of_Kilbirnie" id="mwDT8" rel="mw:WikiLink" title="Barony and Castle of Kilbirnie">Kilbirnie Castle</a></b> <i id="mwDUA">(ruins pictured)</i> in <a href="./North_Ayrshire" id="mwDUE" rel="mw:WikiLink" title="North Ayrshire">North Ayrshire</a> includes a 15th-century <a href="./Keep" id="mwDUI" rel="mw:WikiLink" title="Keep">keep</a> with walls that are <span about="#mwt45" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"7"},"2":{"wt":"to(-)"},"3":{"wt":"8"},"4":{"wt":"ft"}},"i":0}}]}' id="mwDUM" typeof="mw:Transclusion">7</span><span about="#mwt45" typeof="mw:Entity"> </span><span about="#mwt45">to 8 feet (2.1–2.4</span><span about="#mwt45" typeof="mw:Entity"> </span><span about="#mwt45">m)</span> thick?