The Leaning Tower of Pisa is slowly being straightened thanks to a series of restorations that took place in the 1990s to save the crooked landmark.
The Huffington Post reports that the structure–located in the Italian city of Pisa–is 2.5 centimeters straighter now than it was back in 2001 when the tower’s arc was first monitored. The tower went through a series of interventions meant to straighten it from 1992 to 1999, and they appear to be working.
The lengthy and meticulous restoration included a reinforcement of the first floor, a new underground structure for the tower and an underground excavation that lowered the base of the tower. This process seems to be paying dividends now that the tower’s vertical incline is being reduced and experts say that the Italian landmark should be safe for at least two more centuries.