Peñafiel

Peñafiel is a town in the province of Valladolid, Spain, best known for its [http://es.wikipedia.org/wiki/Castillo_de_Pe%C3%B1afiel castle] and for its medieval square used for bullfights and named "el Coso". The square is surrounded by private homes but since medieval times the rights to use their windows, balconies and doorways during bullfights are owned by the town who auctions them to the highest bidders.

The town is full of deep excavated underground caves which were traditionally used to store the wine because of the constant temperature they kept all year around. These caves have chimney vents for ventilation and to evacuate the gases generated by the fermentation of the wine. These chimney vents dot the landscape in and around the town and the castle.

In 2006 it had a population of about 5500.