San Gimignano is in the province of Siena and is in the Unesco heritage listed-buildings project. It has Etruscan settlements and it was inhabited by ancient Romans and some barbarians afterwards. But its urban structure hasn't changed since the Middle Ages.

Piazza Duomo and its three towers in the town centre (XIIIth century) are some of the world's most famous landmarks and they stand for the magnificence of San Gimignano in the Middle Ages.

The Duomo Cathedral (XIth century) in piazza Duomo, the church of Sant'Agostino (XIIIth century) and the Pieve (parish church) of Santa Maria (XIIIth century) are among the best known historical buildings.

Volterra is in the province of Pisa and has been inhabited since the Iron Age. Volterra was one the most flourishing 12 towns of the ancient Etruscan confederation as you can still see from the city walls (IVth century B.C) which were buillt to protect the town against attacks. Porta dell'Arco and Porta Diana have Etruscan origins as well. When the Etruscan civilisation was destroyed by Romans, Volterra started to loose its importance (Ist century A.D)

Volterra is a best-known in the world for its alabaster quarries. Alabaster is a tenderer kind of marble and it is used to build sculptures and small pots. It can still be bought in lots of shops in Volterra. 

Remains of the Teatro Romano (Roman theatre) just outside tie town walls, The Fortezza Medicea ( XVth century, a fortress that belonged to the Medici family) XVth century) the Duomo Cathedral (XII-XIIIth century) and the baptistry of San Giovanni (XIIIth century) are other historical sights worth visiting.

Don't forget the Palazzo dei Priori (XIIIth century), the most ancient tuscan town hall (XIIIth century)