The aquarium is small, modern, and free. It's very close to the Castle, inside Parco Sempione, so it's easy to just pop over for half an hour when you are sight-seeing. The exhibits are on the different water ecosystems of Italy, and start with mountain systems and move clockwise through lakes, rivers, to the Mediterranean. I recommend taking a left when you enter, starting at the mountains, even though your eyes will be immediately drawn to the cool oceanic tanks to the right... Make sure to check the opening hours on the website; as it's free entry year round, the hours are limited and I think they have a lot of closed days. Also, the outside of the building itself is unique, it's in the Italian Liberty style with some cool tile work.
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