Maretarium

Lonely Planet review

If you've ever wondered what swims beneath the surface of Finland's many lakes, rivers and seas, the impressive Maretarium reveals all in a series of giant fish tanks, each representing a particular body of water; the Baltic tank is open to the air. It's all very informative; the usual suspects are here: perch, salmon, bream, Arctic char and herring, but there are also a few less common visitors such as the lumpsucker and the heinous-looking four-horned sculpin.

Though visually not on a par with a tropical aquarium, it's a more educational experience, and there's English labelling, guided tours and a theatrette. And if all those fish are making you hungry, the town's best fish restaurant is next door.