Seeing the leaning tower of Pisa in person is like seeing the Eiffel Tower in person, it's so famous and you've seen it so many times but seeing it first hand is almost unreal. The leaning tower is next to the baptistry and the church. When you take a step back you can see how far off balance the tower is compared to the other buildings. Apparently the whole piazza is sinking, and even the church has had extra levels added on to make it straight. The tower was closed in 1989 because of safety reasons but has opened back up again to climb, definitely worth it!