The Leaning Tower of Pisa, in Tuscany, owes its characteristic lean to poorly made foundations. Conservation work has ensured the 12th century bell tower does not fall over.

• 举世闻名的意大利比萨斜塔因塔基部分假设缺陷而发生倾斜，但斜塔长年斜而不倒，就连建筑学家都确信，这座建于12世纪的古老建筑不会倒塌。