This popular Washington, DC aquarium is situated at Herbert. C. Hoover Building that is bordered by the 14th Street NW at the eastern side and on the western border of this building is the 11th Street NW.
On its south, there is Pennsylvania Avenue NW and on its north, the Constitution Avenue NW' is situated.
The aquarium is home to more than 250 species and 1500 specimens. Animal exhibits include: leopard sharks, bony tail chub, long nose gar, longsnout seahorse, chambered nautilus, eastern hellbender, tiger salamander, giant octopus, loggerhead sea turtle, American alligator, snake head, etc. This aquarium was opened in 1873.
http://www.yelp.com/biz/national-aquarium-washington
http://travel.yahoo.com/p-travelguide-2818558-national_aquarium_district_of_columbia-i