Riddle of the Leaning Tower

Links

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http://torre.duomo.pisa.it/index_eng.html
The official website of the tower, with interactive picture gallery and complete history.

http://www.pbs.org/wgbh/nova/pisa/interventions.html
A list of the engineering interventions designed to halt or reverse the lean.

http://www.uoguelph.ca/~mosers/
The Leaning Tower of Pisa — An engineering disaster, a societal triumph. Interesting article on the history of the Leaning Tower and the interventions to try to prevent its collapse.

http://www.columbia.edu/~jhb3/project/pisa/1998-07-18.html
Sceptical article from ‘The Times’ of 18 July, 1998.

http://www.endex.com/gf/buildings/ltpisa/certiCD.jpg
Architectural elevation and cross-section of the tower.