National Aquarium, Baltimore, MD (September, 2003)

 
The building is built so the exhibits encircle a large tank with sharks, rays, and sea turtles.  What is really cool is that as you progress up the 3 or 4 levels of the aquarium to pass directly above this tank on escalators.  Then as you make your way back down, you travel on "switchback" ramps that run along the insides of a large circular tank. 
 
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