The Leaning Tower of Pisa is one of the world’s most recognizable landmarks. Though it narrowly missed being one of the original Seven Wonders, its tilt and medieval design have secured it a spot on many modern “wonders” lists. Here are some fascinating facts behind this enduring marvel.

8 amazing facts about Leaning Tower of Pisa

Pisa Cathedral and Leaning Tower with tourists, Pisa, Italy.

1. Built on marshy land

Pisa means “marshy land”, and true to its name, the tower was built on soft clay soil with shallow foundations. This poor planning is exactly what led to its famous tilt after only the second floor was completed.

Aerial view of the Leaning Tower of Pisa and Pisa Cathedral, Italy, on a sunny day.

2. Not a standalone icon

Despite its fame, the Leaning Tower is just one part of a grand religious complex. It serves as the bell tower for Pisa Cathedral, alongside the Baptistery and Camposanto, forming the iconic Piazza dei Miracoli.

Pisa Cathedral and Baptistery with tourists exploring the square.

3. Other buildings sink too

It’s not just the tower, other buildings in the square are also sinking. Even the cemetery, laid with sacred soil from Jerusalem, hasn’t escaped the effects of Pisa’s unstable ground.

Visitors posing creatively with the Leaning Tower of Pisa in Italy.

4. It once leaned the other way

During construction, the tower’s center of gravity shifted. After leaning north during the third floor, later floors pulled it back south to its current tilt. It’s not just leaning; it once leaned twice.

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Leaning Tower of Pisa with Pisa Cathedral on the left during a walking tour.

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5. Mussolini made it worse

In 1934, Mussolini, ashamed of the tilt, ordered engineers to drill holes in the base and inject concrete to straighten it. Ironically, the effort only increased the tilt, making it worse than before.

Leaning Tower of Pisa upper levels with sunset sky in Pisa, Italy.

6. Used as a Nazi observation post

During World War II, German soldiers used the Tower as a lookout. When Allied troops saw its beauty, they spared it from destruction.

Tourists lined up to enter the Leaning Tower of Pisa, Italy.

7. It may start tilting again

The fix isn’t forever. If left untouched, the tower may begin tilting again by the 23rd century. For now, it’s safe, but future generations may need another rescue mission.

Tower and Church of San Nicola in Pisa with brick facade and circular window.

8. Pisa has other leaning towers

Pisa’s ground is so soft, other towers lean too! The bell towers of San Nicola and St. Michele dei Scalzi both show visible tilts—making Pisa the unofficial capital of unintentional architecture.