Basilica dell'Osservanza located in the administrative territorial entity Siena
The Basilica dell'Osservanza is a church on the outskirts of Siena, region of Tuscany, Italy.History
A hermitage is known at the site since 1192, and in 104 was donated to San Bernardino of Siena, who began construction of a church around 1420, consecrated in 1451 by the Archbishop Niccolo Piccolomini, and completed around 1490, probably designed by Francesco di Giorgio (Cecco di Giorgio). Further expansion of the  church was commissioned between 1495 and 1496 by Pandolfo Petrucci.
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