Goat Island

This guide to Goat Island in Sydney Harbour opens with a stone couch cut into the rock, fitted with iron restraints, where a convict named Charles Anderson was once kept for two years. From there it traces why the colony chose this five-hectare outcrop in the 1830s to store the city's gunpowder, and how chained convict gangs quarried and hauled the sandstone that became the Queen's Magazine. Listen for how much gunpowder one official warned was sitting inside those walls by 1861.