an 18th century fortification built to stop Britain invading Spain
... that the Spanish town of La Línea de la Concepción was built on top of the ruins of an 18th century fortification built to stop Britain invading Spain?
... that the Spanish town of <a href="./La_Línea_de_la_Concepción" id="mwCA8" rel="mw:WikiLink" title="La Línea de la Concepción">La Línea de la Concepción</a> was built on top of the ruins of <b id="mwCBA"><a href="./Lines_of_Contravallation_of_Gibraltar" id="mwCBE" rel="mw:WikiLink" title="Lines of Contravallation of Gibraltar">an 18th century fortification built to stop Britain invading Spain</a></b>?