The Museu de Marinha is a nautical flashback to the Age of Discovery with its armadas of model ships, cannonballs and shipwreck booty. Dig for buried treasure like Vasco da Gama’s portable wooden altar, 17th-century globes (note Australia’s absence) and the polished private quarters of UK-built royal yacht Amélia . A separate building houses royal barges, 19th-century fire-fighting machines and seaplanes.