Fixing leaning tower of Bologna will take at least 10 years and €20m, says mayor

Matteo Lepore compares project to save 12th century Garisenda tower from collapse to 10-year effort to preserve the tower of Pisa

Work to prevent the collapse of a leaning medieval tower in the heart of the northern Italian city of Bologna will cost 20m ($21.5m) and take 10 years at least, its mayor has said.

Last weekend, the city unveiled a 4.3m (3.7m) project to shore up the Garisenda tower - one of the city's two towers that look out over central Bologna, providing inspiration over the centuries to painters and poets and a lookout spot during conflicts.