A big hinge...correction apparently it's a bolt so in the fashion of Pratchett it shall be called the big metal thing that slides and stops things fro

You have to book in to climb the tower of Pisa and I think each group only takes up to 40 people. And the tours are every 20 minutes. We had a bit of time so we walked around the square a bit.

We came across this really big slidey metal mechanism that stops things from entering or exiting, which was on a huge gate. Behind the huge gate was a ...cemetery. Which begs the question is the gate to keep people out? or whatever's in the cemetery in?(cue lightening, thunder and scary music).

To be honest, I just thought 'That's a really big slidey metal mechanism. Cool.Take a photo.'