If you wanted to visit the world's largest fish tank, you'd have to go to Okinawa, Japan, home of the "Kuroshio Sea," otherwise known as the Churaumi Aquarium. Their fish tank is so humongous, it holds four whale sharks – the biggest fish alive!
Not only is the local sea life that's housed in the tank beautiful to look at, but the observation window at the Churaumi is a marvel on its own.