Everyone has heard of the leaning tower of Pisa (1), but Bologna, also in Italy, has two leaning towers. The taller of these, Asinelli (2), at around 97 metres, is higher than Pisa’s, which is just short of 56 metres.
Like Pisa’s tower, Bologna’s were originally built in the twelfth century, and began to lean almost as soon as they were built. The shorter tower, Garisenda, is 48m tall. Originally around 60m tall, it was shortened in the fourteenth century because its lean made it increasingly dangerous. At an angle of about 4°, its slant is about the same as Pisa’s tower.
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