The Butterfly House & Aquarium is a family-friendly stop in Sertoma Park, pairing a warm butterfly conservatory with the Dakotas' rare public saltwater aquarium displays. It is smaller than a big-city aquarium, but the combination of butterflies, corals, jellyfish, and hands-on education gives Sioux Falls a useful indoor nature attraction.
It works especially well when the weather is too hot, too cold, or too wet for another hour outside at Falls Park. Travellers without children may still enjoy the conservatory if they like close-up wildlife watching, but it is best approached as a relaxed local attraction rather than a headline museum.