This Day In History: January 7, 1990 The Cathedral in Pisa’s free-standing bell tower obviously wasn’t intended to be lopsided. When construction began in August of 1173, everything seemed OK at first. But the builders set the tower on a too-small foundation in unstable, weak soil. By the time construction had reached the third floor in 1178, the structure had … Continue reading This Day in History: January 7th- Leaning