The one at Pisa, in Italy, is 178 feet in height, and leans about 14 feet. At Caerphilly, in Glamorganshire, there is a tower which leans eleven feet in eighty.
“The Leaning Tower of Pisa continues to stand because the vertical
line drawn through its centre of gravity passes within its base.” —
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894