Duomo di Siena, Siena's Cathedral, as it is seen today, stands on a plot of land that has always been dedicated to religion. Archaeological research has shown that there was a shrine built here as early as the 3rd Century. The Church of Santa Maria was built on top of that and then the current Duomo, which began at the end of the 12th Century. It is based on a Latin cross design with three naves. The polychrome marble facade is quite extraordinary. The entrance to the Libreria Piccolomini can be found in the nave on the left. The area dedicated to religious functions is enclosed and must not be entered during Mass as a sign of respect. Photographs are not allowed inside and all mobile phones should be turned off whether services are being held or not.
