Explanation

The Leaning Tower of Pisa, or simply, the Tower of Pisa, of Pisa Cathedral.

It is known for its nearly four-degree lean, the result of an unstable foundation. 

Height: 57 m

Opened: 1372

Construction started: August 9, 1173

Architects: Diotisalvi, Guglielmo

Province: Province of Pisa

Materials: Marble, Rock

Architectural style: Romanesque architecture