It is headquarters of the Greater London Authority, which comprises the Mayor of London and London Assembly. Because of it's curious shape, it has been compared with many things, from a misshapen egg, to a motorcycle helmet and an onion. Designer Norman Foster intended to reduce its surface area and thus improve energy efficiency.
A 500-metre (1,640 ft) helical walkway, similar of the one from Guggenheim Museum in New York, ascends the full height of the building. At the top of the ten-story building there is an exhibition and meeting space called "London's Living Room". The walkway provides views of the interior of the building, and is intended to symbolise transparency.
Walk around all way up to Tower Bridge
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