In September 1999 a two-and-a half year soil extraction process reduced the tower’s inclination by half a degree to 5.5 degrees, resulting in the seventh storey overhanging the first by 4.5 metres (14.76 feet).
This is the most famous leaning tower in the world, but not the only one. Others include Oldehove in Leeuwarden and Puerta de Europa in Madrid.
The tower rises 55 meters above the ground, 58.36 meters from the foundation.
There are 293 stairs to the roof.
The tower, which is a hollow cylinder surrounded by colonnades, weighs around 14,500 metric tonnes.
The tower’s construction began in 1174 when, on reaching a quarter of the way up the fourth storey around 1178, construction stopped, not to be resumed until around 1272. Construction stopped again at the seventh storey in about 1278 and resumed around 1360 with completion in 1373.
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