The Leaning Tower of Pisa is a freestanding bell tower located in Pisa, Italy, known for its unintended tilt. Construction began in 1173 and took nearly 200 years to complete, resulting in a unique architectural marvel that attracts millions of visitors each year. Standing at about 56 meters tall, the tower features a series of white and gray marble columns and arches. Its famous lean is due to unstable foundation soil, which has been a subject of engineering studies. Despite its tilt, the tower remains a symbol of Pisa and a UNESCO World Heritage Site.