Cabrera Mallorca Goat island

'Goat island' is the largest in a rocky archipelago lying 20km off the south coast. Pliny claimed it as the birthplace of Hannibal; during the Napoleonic Wars it became a notorious prison camp. Since 1991 the island has been a protected national park. You can only get there on a day trip by boat, with time to walk up to the 14th-century castle above the harbor. Visit a museum housed in an old wine cellar and swim in the Blue Grotto on the way back.