Korakou culture
... that the Greek Korakou culture had two-storey buildings with internal stairs more than 4,000 years ago?
... that the Greek <b id="mwBVU"><a href="./Korakou_culture" id="mwBVY" rel="mw:WikiLink" title="Korakou culture">Korakou culture</a></b> had two-storey buildings with internal stairs more than 4,000 years ago?