Located on Old Town Square, better signage might go a long way to helping fish fans find this small aquarium. Located in the courtyard of Paláce Kinských, turn right immediately upon entering and head down the stairs. Aquariums are percolating away, the dark corners are draped with ropes and nets. The fish appeared clean and happy, if only a little bored. Shells, fossils, bones and descriptions of fish in Czech, English, German and Russian are laid out in a circular fashion. All the tanks state which fish are hanging out inside but it’s probably only interesting for true fish fanatics.