There are hobbies, and then there are obsessions. This guy, well, he has an obsession.

Meet Bill Wann - he's an engineer from Wisconsin and he's really good at building stuff. When it came time to decorate his home, he decided that he wanted not just a fish tank, but the largest privately owned tank in North America. So he built it.

The aquarium is massive. It holds over 20,000 gallons of water, hundreds of fish, and is all plumbed with miles of piping. Bill has to clean the inside of the tank from the inside with SCUBA gear on. The electric bill alone to power all of the lights and other accessories for the aquarium is $1,200. He estimates that the total cost of the tank is around the $500,000 mark.

Bill said that plans are already in the works for an aquarium that is four times the size of his current one. So if you thought this one was impressive, just wait for the next iteration!