architecture in Luxembourg
... that the earliest remains of architecture in Luxembourg are the Celtic buildings at Titelberg ?
... that the earliest remains of <b id="mwAUk"><a href="./Architecture_of_Luxembourg" id="mwAUo" rel="mw:WikiLink" title="Architecture of Luxembourg">architecture in Luxembourg</a></b> are the <a href="./Celts" id="mwAUs" rel="mw:WikiLink" title="Celts">Celtic</a> buildings at <a href="./Titelberg" id="mwAUw" rel="mw:WikiLink" title="Titelberg">Titelberg</a> <i id="mwAU0">(pictured)</i>?