The Castillo de San Sebastián, a crumbling 18th-century fortress at the end of a long causeway in Cádiz, Spain, was locked behind an iron gate. But on the June morning I visited, the tide was low, and ...

Add articles to your saved list and come back to them any time. This article is part of Traveller’s ultimate guide to cruise ports.See all stories. The fortified, peninsular town of Cadiz, ancient but ...