The Museo di Storia Naturale del Mediterraneo is one of Livorno's better indoor stops, especially for families or travellers caught by poor weather. Its collections focus on natural history and the Mediterranean environment, with exhibits that widen the city beyond canals, seafood, and port history.
It sits outside the most obvious tourist circuit, so check opening hours before you go. The museum is useful if you want a slower, more educational break from the waterfront, and it pairs well with a walk through the surrounding residential streets rather than a rushed dash from the harbour.