barrel vault
...that the barrel vault was developed chiefly by the ancient Greeks and Romans, but endured to be a mainstay of medieval and even modern architecture?
...that the <b id="mwBY0"><a href="./Barrel_vault" id="mwBY4" rel="mw:WikiLink" title="Barrel vault">barrel vault</a></b> <i id="mwBY8">(pictured)</i> was developed chiefly by the <a href="./Ancient_Greece" id="mwBZA" rel="mw:WikiLink" title="Ancient Greece">ancient Greeks</a> and <a href="./Ancient_Rome" id="mwBZE" rel="mw:WikiLink" title="Ancient Rome">Romans</a>, but endured to be a mainstay of <a href="./Medieval_architecture" id="mwBZI" rel="mw:WikiLink" title="Medieval architecture">medieval</a> and even <a href="./Modern_architecture" id="mwBZM" rel="mw:WikiLink" title="Modern architecture">modern architecture</a>?