Barefooted workers stand on squashed grapes after ending work at the Vargelas vineyard in the Douro wine region in northern Portugal on September 13, 2006. For centuries, wine producers have laboured in the rugged Douro region, refining wine-making traditions that are as entrenched as the steep valleys in the home of Portugal's unique port wines. To match feature PORTUGAL-WINE. REUTERS/Jose Manuel Ribeiro (PORTUGAL)