the leaning tower of pisa is a building in pisa, italy. it is a bell tower. it is famous because it is not vertical. in 1990 the tower was leaning at 5.5 degrees and increasing. after that, much restoration work has been done to stop it from falling over completely. there was scaffolding all around the tower for 20 years. on 26 april 2011, the last bit of scaffolding was removed so that the tower can be seen properly again.