Crypt del Duomo

The sanctuary of Siena Cathedral is on the hill. Having gone down the stair you can get into the crypt of Siena Cathedral to have a look at beautiful frescoes of 13 century. The crypt is the underground spaces of a Roman church, which was on the site of today cathedral. For several centuries it was filled with sand used to reinforce the foundation of the cathedral. The crypt was opened for tourists only in 2004.