evidence: The Squabble That Never Ends: Britain and Spain Duel Over Gibraltar One recent morning, a mile-long line of cars waited to cross the international border separating Spain from Britain's Rock of Gibraltar. Spanish border guards were stopping every car, resulting in long lines that could take up to six hours to cross. [...] To Spain, Gibraltar is just that — a colony — left over from the British Empire. It's a peninsula physically attached to Spain, so it should belong to Spain — or so the thinking in Madrid goes.