See all Attractions in Siena Siena for: Adventure, Food And Dining, Art And Culture, Nightlife, Spa, History, First Timers, Family, Romance, Shopping Basilica dell'Osservanza About The Basilica dell'Osservanza is a church on the outskirts of Siena, Italy. It was built around 1490, probably designed by Francesco di Giorgio. The church was expanded between 1495 and 1496 by Magnifico Despota Pandolfo Petrucci. Add to Wish List
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