Certosa di Maggiano, Renaissance Carthusian monastery in Siena, Italy.

Certosa di Maggiano is a monastic complex near Siena featuring Renaissance-style proportions and carefully carved stone details throughout its buildings. Multiple courtyards arranged in an orderly pattern surround the structures, with views extending toward the rolling Tuscan landscape beyond the walls.

A cardinal established this monastery in 1316 as a Carthusian community in the Siena region. Over the following centuries it remained a working religious site until eventually moving toward other purposes.

The complex is named for the Carthusian order, but the church became Siena's parish church of San Nicola after Grand Duke Leopold suppressed the house in 1785. Bartolomeo Cesi decorated the dome in 1594–1595 and painted an Assumption of the Virgin for the altar, now in Siena's cathedral. The blessed Pietro Petroni entered here at 17.

Advance reservations are necessary to enter the interior, as the property now functions as a small hotel accommodation. Planning ahead and contacting in advance ensures you can arrange access to see the chapel and courtyards.

The church, spared when Leopold II sold off the rest of the charterhouse, became a parish church under Saint Nicholas. Its altarpiece, Bartolomeo Cesi's Assumption of the Virgin painted in 1594-1595, is now in Siena Cathedral. The wooden choir stalls were the work of Sienese sculptor Antonio di Neri Barili.