Why does the leaning tower of pisa lean?? What's inside it??

Question

Why does the leaning tower of pisa lean?? What's inside it??

Answer 1

It was built on very sandy soil.  It even started to lean while they were building it.  Inside is a long staircase of hundreds of steps.

Answer 2

it is a matter of foundations and sandy soil. Foundations go deeper into the soil as time goes by.

Answer 3

It leans because the ground un neath it is sinking. The only thing that is in it is steps to get to the top. They go around the inside wall from the bottom to the top and then back down.