toward Monte Amiata and about 8 km. After Pienza at the first crossroad turn right for Siena. After 2 km. On yout left hand side you will find the Spedaletto Castle.
FROM SOUTH: Exit Chiusi-Chianciano of the A1 motorway Firenze-Roma in direction of Firenze, let's continue towards Chianciano Terme and from Chianciano follow the signs for La Foce-San Quirico.