What would the Tower of Pisa be if it weren’t leaning? Not as interesting, and certainly not as attractive to tourists. That was the issue faced by the late-20th-century engineers who figured out what caused the lean and devised a way to reduce the tower’s angle of tilt. Take a journey through the centuries to explore how various engineers tried to stabilize the leaning tower, but only succeeded in making the problem worse. Today, the Pisa tower has been saved; but what about the more recent “Leaning Tower of San Francisco�