It is worth to climb up more over 400 stairs to the top of this tower and enjoy this amazing view of the Florence from each side. It´s one of the thing you have to do when you are in Florence.
The steps get so narrow at some points even taking an other step is so dangerous. But when you arrive to the top the view is so amazing it worths every minute of it. Going down is another adventure :)
Come directly after the opening time for a less crowded experience. The stairs get narrow to the top, but the view is amazing and worth it. Only climb the duomo afterwards if you felt ok here.
Unlike the cathedral the queue is much shorter here. The view on the cathedral dome is wonderful. However the fence makes taking good photos hard. Also on top there is no cover during the rain.