The Last Frontier of Al Andalus Not content with just one wall, President Trump has urged Spain to build one along the length of the Sahara, as a solution to Europe´s migrant crisis. Clearly a ridiculous idea - not sure he knows that´s over 3000 miles long and it´s not in Spain - but it got me thinking about what the “border” must have been like that divided Catholic Spain from Muslim Al Andalus , some 700+ years ago… Map: The Last frontier of...