An experience you shouldn't miss when you're in Florence is to climb upstairs unto the lantarn between the two domes.

While climbing you can clearly see that Brunelleschi placed the bricks as a herringbone. It's another trick to hold the dome together.

In 2014 architect Massimo Ricci builded a model of Brunellsechi's dome at a scale of 1:5. He didn't finish his dome so people got a better view on the building techniques.[br]And he didn't construct stone and wooden rings and didn't have to lift the building material 90 m high ...[br]There's a youtube film on [url=https://www.youtube.com/watch?v=QWz90KdrDBs]model_Ricci[/url].