Leaning Tower of Pisa is on high alert over fears of collapse.

The Garisenda tower in Italy's Bologna, also known as the 'leaning tower', has been steady for nearly 1,000 years.

This tower is now at a risk of collapsing due to excessive leaning.

The 150-foot tall tower has been leaning at an angle of 4 degrees since the 14th century.

The iconic Tower of Pisa leans at 5 degrees.

Italy has done extensive work over the years to maintain the integrity of the tower.

A metal cordon will now be put up around the tower to contain the debris.

And reduce the vulnerability of surrounding buildings in case of a collapse.

Cracks in the stones used in the base could be the reason for excessive leaning.