Osaka Aquarium in Japan

You must buy tickets in advance and enter within the specified time. The main arrangement inside the museum is to first take a long elevator, and then gradually tour downwards. It mainly shows from the surface of the sea to the bottom of the sea. Different fish species are present at different layers. Overall, this aquarium is worth visiting. The visiting time is 3h to 4h. At the end, there will be a souvenir shop, personally, I think the keychains are quite OK, you can buy one.