Public aquariums are wonderful places to visit, and many of them have terrific websites too!  Here are some of the best:

Alaska Sealife center 

Florida Aquarium

Monterey Bay Aquarium 

Mystic Aquarium 

National Aquarium in Baltimore 

New England Aquarium 

Oregon Coast Aquarium 


Shedd Aquarium 

South Carolina Aquarium

Texas State Aquarium 

Virginia Marine Science Museum 

These are some more great resources:

Ocean Link

The Marine Biological Laboratory

Rhode Island Sea Grant Fact Sheets

I will be adding more links very soon!