Japan's Osaka Kaiyukan Aquarium is one of the world's largest and is considered Japan's best.
The aquarium's centerpiece is the Pacific Ocean tank, whose star is Kai-kun, a 16-foot-long whale shark. Kai-kun shares his tank with a majestic manta ray known for his acrobatic swimming style.
A postcard showing the massive multistory size of the Kaiyukan's largest tank.
Kai-kun, the aquarium's star attraction.