Yesterday the rain came and went, as it does in Florence. I was able to plan around it and NOT buy an umbrella. I spent about two hours in the Museo del Duomo, which was completely refurbished a few years ago. On the first floor is an amazing display of sculpture laid out as it might have been during the 14th and 15th century before Archduke Francis I demolished the facade for a high Renaissance one. Appropriate music throughout encouraged visitors to be calm and subdued as they might be in a church. The second floor is dedicated to the building of the dome, as well as displaying the original sculpture from the bell tower.
(Having trouble again posting pictures. Will try later._