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. The acrylic-resin window clocks in at 26 feet high by 73 feet wide, and almost two feet thick in order to hold the pressure of the water which is pumped in from 300 feet offshore. Don't the people in this picture look like fish food compared to these massive sea creatures!?

And I thought Aquatica was huge!