Famous the world over for its graceful architecture and unique lean.
Building on the tower started in 1173 but was interrupted following the subsidence which is actually the cause of its lean. Work was resumed in 1275 under Giovanni di Simone and completed, it is believed, by Tommaso di Andrea di Pondera towards the end of the fourteenth century. The north side of the tower is 55.22 metres tall, whilst the south side reaches a height of only 54.52 metres with a deviation from the vertical of 4.265 metres.
It was here that Galileo Galilei carried out his famous experiments on the fall of bodies.
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