Leaning Tower of Pisa
The Seven Wonders of the medieval world
Building began on the Bell Tower of Pisa Cathedral, Italy, in 1173. Soon the foundations began to sink on one side.The design was adjusted, but the time the tower has reached its full height of 55m (179ft ) it was leaning sharply. The tilt increased over the centuries and it is amazing that the 14000 tonne structure is still standing
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