The curved, colonnaded, neoclassic hulk of County Hall once housed London's local government administration (now at the Norman Foster-designed City Hall building farther downriver by Tower Bridge). Now it's where you can catch a dark and thrilling glimpse of the waters of the world, focused around a superb three-level aquarium full of sharks and stingrays, among other common and rarer breeds. There are also educational exhibits, feeding displays, and hands-on displays—including a tank full of nonvenomous rays that you can touch if they swim near enough—they seem to like having their backs tickled. It's not the biggest aquarium you've ever seen—especially if you've been to SeaWorld—but the exhibit is well arranged, with areas for different oceans, water environments, and climate zones, including a stunning coral reef and rain forest. There are regular feeding times and free talks throughout the day. Look out for new additions to the tanks from the conservation breeding program.
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