Pisa
The leaning tower

Few people does not know the leaning tower at Pisa, it was built in 1173, owing to the crumbly state of the ground upon which Pisa stands. the tilt of leaning tower was noted immediately during construction. The tower is 179 feet tall and every year its inclination increases. Obviously, the correction is still on the way, the heavy equipment can be seen about 50 meters behind the tower.