Giardini Indro Montanelli

One of Europe's oldest aquariums, in an Art Nouveau building covered in tiled sea creatures, with octopus, moray eels and fish from Italian rivers and seas.

Children's museum in a round cloister, with play exhibitions split by age, from a reuse workshop for toddlers to nature rooms for ages 6 to 11.

Fifteenth-century castle with towers, a dry moat and a huge courtyard that's free to walk into.