Val d'Orcia and Pienza connect the history of a working Tuscan landscape with one of the Renaissance's most influential experiments in urban design. The valley south of Siena contains cultivated hills, farms, roads and fortified settlements shaped over many centuries. Pienza stands within that wider setting but has its own distinct history. Their relationship is not that of a city placed in untouched scenery. Both town and countryside reflect human decisions about agriculture, movement, property, defence and the visual ordering of inhabited space.

The valley developed within Siena's agricultural hinterland, where rural production and urban wealth were closely linked. Farms and villages occupied a landscape crossed by important routes, including the Via Francigena. Fields, woodland and settlements changed through cultivation and systems of landholding, including sharecropping. The admired views therefore depend on generations of practical work as well as aesthetic response. It would be misleading to imagine every cypress line or present field boundary as part of a single surviving Renaissance plan; the landscape continued to evolve after that period.

Pienza began as Corsignano, the birthplace of Enea Silvio Piccolomini, who became Pope Pius II in 1458. He commissioned a transformation of its centre, working with the architect Bernardo Rossellino. Construction during the following years created a carefully related group of buildings around the principal square. The cathedral, papal family palace and civic architecture demonstrated how proportion, alignment and controlled views could reshape an existing settlement. The project was ambitious but selective, rather than the creation of an entirely new city on previously unoccupied ground.

The arrangement of the square makes buildings respond to one another, while the Palazzo Piccolomini's relationship with the valley extends the architectural experience beyond enclosed urban space. This integration helps explain Pienza's importance in discussions of Renaissance planning. At the same time, the project expressed papal patronage and family status. Its ordered appearance was inseparable from the authority and resources of its commissioner. After Pius II's death in 1464, the town continued to live within the framework created by that unusually concentrated episode of rebuilding.

Pienza's historic centre entered the World Heritage List in 1996, and Val d'Orcia followed as a cultural landscape in 2004. These are related but separate inscriptions, recognising different scales of heritage. Together they encourage attention to the connections between a designed town and its productive surroundings. Their history lies in the meeting of ideals with practical life: monumental patronage required resources, agriculture sustained communities, and later inhabitants maintained and altered the places that visitors now perceive as a remarkably harmonious image of the Tuscan Renaissance.