West Wallabi Island
... that remnants of defensive walls and stone shelters on West Wallabi Island, constructed by survivors of the 1629 Batavia shipwreck, are the oldest known European-built structures in Australia?
... that remnants of <a href="./Defensive_wall" id="mwA-g" rel="mw:WikiLink" title="Defensive wall">defensive walls</a> and <a href="./Dugout_(shelter)" id="mwA-k" rel="mw:WikiLink" title="Dugout (shelter)">stone shelters</a> on <b id="mwA-o"><a href="./West_Wallabi_Island" id="mwA-s" rel="mw:WikiLink" title="West Wallabi Island">West Wallabi Island</a></b>, constructed by survivors of the 1629 <i id="mwA-w"><a class="mw-redirect mw-disambig" href="./Batavia_(ship)" id="mwA-0" rel="mw:WikiLink" title="Batavia (ship)">Batavia</a></i> shipwreck, are the oldest known European-built structures in <a href="./Australia" id="mwA-4" rel="mw:WikiLink" title="Australia">Australia</a>?