THE LEANING TOWER OF PISA (Pisa, Tuscany, Italy)
Nearly 186 feet high (on the high side), the freestanding bell tower of Pisa Cathedral is famous for its nearly 4° lean. The foundation was improperly laid over soft ground; the lean began during construction. At its worst it was 5.5°; it was straightened 1993-2001. Galileo famously (if apocryphally) used the tilt to drop cannon balls in demonstrating the law of free fall.
(Image courtesy Wikimedia Commons; CTTO)
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