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Although the Campanile(bell tower) was designed to be perfectly vertical, the result turned out to be somewhat different. Five years after construction started in 1174 by Bonanno Pisano, the tower started sinking into the ground due to poor laid foundation. The construction was stopped for almost a century and resumed by Giovanni di Simone who completed four more floors. Finally in 1370 construction was finished after the bell chamber was added.In 1998, work started to stabilize to tower and ...
Leaning Tower of Pisa is made entirely out marble& leans out 16 ft. It is built on sand, & started leaning after 3 stories were built, plans were changed & it continued to be built. In the last 100 yrs, it has leaned another ft. Engineers believe it will eventually fall.