We visited the Osaka aquarium (Kaiyukan) on a rainy day. The aquarium is located on the shore of Osaka bay, next to the Tempozan Ferris wheel. The outside of the building is peculiar and definitely hard to miss. The visit starts on the top floor greenhouse with an exhibit representing the Japanese forest; small mammals and amphibians are on display. The lower floors contain various tanks with sea mammals, fish and some reptiles. The main tank of the aquarium is impressively large and spans several floors in height and hosts the famous whale shark which was unfortunately photo-shy on that day. On the lower floors, giant Japanese spider crabs and an impressive collection of jellyfish steal the show.