Tower of pisa lean

Leaning since its construction in the 12th century, the Tower of Pisa attracts millions and symbolizes the world's most famous architectural flaw.

About this subject

The Leaning Tower of Pisa, located in the Piazza dei Miracoli in Pisa, Italy, began construction in 1173 and already showed a tilt during the works, due to the soft clay soil. Originally designed as the bell tower for Pisa Cathedral, its construction took nearly 200 years, with breaks that allowed the ground to partially settle, preventing a total collapse. The tower stands about 56 meters tall and weighs approximately 14,500 tons. Over the centuries, the lean gradually increased, reaching a maximum angle of 5.5 degrees before stabilization interventions in the 1990s and 2000s. Engineers used techniques such as controlled soil removal from the opposite side and installing lead counterweights, reducing the lean to about 3.97 degrees. The structure is considered safe for visitors, attracting around 5 million tourists annually. A historical curiosity: it is said that Galileo Galilei performed free-fall experiments from the tower, though concrete evidence is lacking. The tower was declared a UNESCO World Heritage Site in 1987.

Frequently Asked Questions

Why is the Leaning Tower of Pisa leaning?

The lean resulted from the soft clay soil that could not properly support the tower's weight, causing it to sink on one side early during construction.

What is the current angle of the lean?

After stabilization work in the 1990s and 2000s, the lean was reduced to about 3.97 degrees, down from a maximum of 5.5 degrees prior to interventions.

Is it safe to visit the Leaning Tower of Pisa?

Yes, the tower has been stabilized and is constantly monitored. Visitors can safely climb the 294 steps to the top, and the structure is considered stable for the next 200 years.