Both are great interactive experiences for children & aquatic life. If you have to choose between the 2 I would probably say visit the GA Aquarium, but I live in Atlanta & still take my kids to the TN Aquarium when we are in Chattanooga.
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Tennessee is home to two top-ranking aquariums: The Tennessee Aquarium in Chattanooga, and Ripley's Aquarium of the Smokies, which is in Gatlinburg. Both are worth visiting and feature an array of marine life and special exhibits.
The Tennessee Aquarium has been ranked as one of the 10 best aquariums in the world. Travel website TripAdvisor ranked the Chattanooga-based aquarium seventh in its 2018 rankings. The aquarium finished one spot behind the Dubai Aquarium & Underwater Zoo and ahead of Hawaii's Maui Ocean Center.
One of the best experiences that I have had in Atlanta so far, and high recommended. This is a large and wonderful aquarium and definitely worth the trip. However, it is pricey with a two adults and one child tab for admission being $124.00.
The S.E.A Aquarium in Singapore is the second-largest aquarium in the world. While the S.E.A. Aquarium is the second-largest aquarium in the world, it previously held the record as the largest from 2012 to 2014. This 12-million-gallon aquarium opened in 2012 and is home to over 100,000 animals and 800 species.
River JourneyIt contains a total of 400,000 US gallons (1,500,000 L), and was the largest freshwater aquarium in the world when it opened. It is organized around the theme of the Story of the River, following the path of a raindrop from high in the Appalachian Mountains to the Gulf of Mexico.