If you don't mind I am just going to list the zoos, because I can't find the hear to rank them as I find it unfair to the smaller Zoos, I also tend to treat each exhibit at each Zoo I visit as an experience in itself. These are only the places I have visited since moving to California back in 2002 as that was when I began my photo archive.
(Zoos)
-Blank Park Zoo, Des Moines, IA (Also first Zoo I visited as a child)
-Bronx Zoo, Bronx, NYC, NY
-Central Park Zoo, Manhattan, NYC, NY
-Charles Paddock Zoo, Atascadero, CA
-Fresno Chaffee Zoo, Fresno, CA
-Henry Doorly Zoo & Scott Aquarium, Omaha, NE
-Living Desert Zoo, Palm Desert, CA
-Los Angeles Zoo, Los Angeles, CA
-Minnesota Zoo, Apple Valley, CA
-Orange County Zoo, Orange, CA
-Pittsburgh Zoo & PNC Aquarium, Pittsburgh CA (site of first date with current fiancee)
-San Diego Wild Animal Park/Safari Park, Escondido, CA
-San Diego Zoo, San Diego, CA (member of)
-Santa Ana Zoo, Santa Ana, CA (member of)
-Santa Barbara Zoo, Santa Barbara CA
(Aquariums)
-Aquarium of the Pacific, Long Beach, CA (Former Volunteer)
-Birch Aquarium, San Diego, CA
-Ocean Institute, Dana Point, CA (Former Intern)
-Sea Life Aquarium, Carlsbad, CA (Former Employee)
-Sea World San Diego, San Diego, CA
-Ty Warner Sea Center, Santa Barbara, CA
-Underwater Adventures, Bloomington, Minnesota (inside Mall of America, soon to be rebranded as a Sea Life Aquarium)
(Others)
-Pacific Marine Mammal Center, Laguna Beach, CA (rehab facility for sick or injured marine mammals, currently rebuilding after mudslide and flood damage)
-Prehistoric Pets "Reptile Zoo", Fountain Valley, CA (private pet store with reptile displays)
-Hubbs Hatchery, Carslbad, CA (breeds White Seabass for release into ocean)
Prior to starting my archive I visited Lincoln Park Zoo, Philadelphia Zoo, St. Louis Zoo, Sea World Orlando, National Aquarium in Baltimore, NAtional Zoo in DC, Aquarium in DC, Shedd Aquarium in Chicago,