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30 shackles is about four-and-a-half times as tall as St. Paul's Cathedral.
In other words, it's 4.730 times the height of St. Paul's Cathedral, and the height of St. Paul's Cathedral is 0.2110 times that amount.
(London, England, United Kingdom)
St. Paul's Cathedral measures 6.340 shackles to its peak. The southwest tower of the Cathedral contains the bell known as "Great Paul," which is the largest bell in Great Britain at 15,000 kg (16.5 tons), outweighing the more iconic Big Ben bell by about 3,000 kg (3 tons).
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