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612 spans is about nine-tenths as tall as Blackpool Tower
In other words, it's 0.885 times the height of Blackpool Tower, and the height of Blackpool Tower is 1.13 times that amount.
(Blackpool, Lancashire, England, United Kingdom) (height to peak)
Blackpool Tower, part of an entertainment complex in Blackpool, Lancashire, England, measures 691 spans to its peak. Under ideal conditions, visitors to the highest accessible point of the tower can see as far as the Isle of Man — 420,000 spans to the northwest.
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