Leaning Tower of Pisa was once closed as it tilted too much
Italy's Leaning Tower of Pisa was reopened to tourists after 11 years on December 15, 2001. It was closed in 1990 as it began to lean too far and was in danger of falling over, following which authorities spent nearly $27 million to reduce its tilt. The 56-metre-high tower developed a tilt as it was built on soft, marshy ground.