The best ones I've been to are the Monterey Bay Aquarium in CA (the BEST), followed by Scripps in La Jolla, CA, followed by Shedd in Chicago, followed by Henry Doorly Zoo's aquarium in Omaha Nebraska (the zoo is one of the best in the world with lots of nice bio-tope aquariums spread through out, but their aquarium's rare animal collection and tidal zone displays are also pretty good). I haven't been to Georgia's, but we're planning a grad school visit down there next spring so I'd love to check it out. I'm sure there are lots of other awesome aquariums, but these are my personal favorites!