It's well worth your while to go out of your way to visit this 12th-century Romanesque abbey, as it's a gem of pale stone in the silvery green of an olive grove. The exterior and interior sculpture is outstanding, particularly the nave capitals, a combination of French, Lombard, and even Spanish influences. The sacristy (seldom open) forms part of the primitive Carolingian church (founded in AD 781), its entrance flanked by 9th-century pilasters. The small vaulted crypt dates from the same period. Above the nave runs a matroneum (women's gallery), an unusual feature once used to separate the congregation. Equally unusual is the ambulatory, for which the three radiating chapels were almost certainly copied from a French model. Stay to hear the canonical hours celebrated in Gregorian chant. On the road that leads up toward Castelnuovo dell'Abate is a small shop that sells souvenirs and has washrooms. A 2½-hour hiking trail (signed as #2) leads to the abbey from Montalcino. Starting near Montalcino's small cemetery, the trail heads south through woods, along a ridge road to the tiny hamlet of Villa a Tolli, and then downhill to Sant'Antimo.