AquaDom - the world's largest cylindrical aquarium
This is something you need to see to believe. It was open to the public on December 2003, so this tank might be old news to some of you, but it's impressive none-the-less.
The AquaDom is a huge cylindrical acrylic and glass aquarium measuring 25 meter (82 feet) tall by 11 meter (36 feet) in diameter. It holds 900,000 liters (237,755 gallons) of water, contains over 1500 fish spanning roughly 50 species, and sits on a 9 meter (30 feet) thick base. The acrylic at the top measures 6.3" thick and at the bottom it's 8.7" thick.
According to the Radisson's website, the fish species include:
Trigger fish, hogfish, humphead wrasse (Cheilinus undulatus), blowfish (Tetraodontidae), surgeonfish (Myripristinae), soldierfish (Tetraodontidae) and swarm fish, like Cero mackerel (Scomberomorus regalis) and Silver moonfish (Monodactylus argenteus).
In order to keep the tank clean, it takes a team of two full-time divers to scrape the tank walls and clean the tank daily. Check out the video below for a detailed look at the tank: