We had lunch at Il Campo, and then toured the city. Old Siena still has an early Renaissance feel to it and the cathedral is beautiful.
The residents that built the cathedral wanted to honor their new devotion to science and reason and also let the church know that they were controlling their own destiny
They had planned a much larger Cathedral that would have cantilever over the city on a hill but the Black Death killed nearly 60% of the population. Siena economy never really recovered from that and Florence took over as the giant power in the region.