Daejeon Expo Aquarium is a family-friendly aquarium in the Expo Science Park area, close to Hanbat Arboretum and Daejeon Museum of Art. It mixes live marine displays with digital media installations, so it works best as a light indoor stop rather than a traditional natural-history visit.
It is most useful on a rainy day or when travelling with children. Pair it with the surrounding civic and Expo-area attractions instead of crossing the city for the aquarium alone.