The valley opens up all at once, a little after you leave Porto behind. Whole hillsides are cut into terraces, and the vines run down toward the bronze-coloured river. It is the oldest demarcated wine region on earth and a World Heritage Site, and people still prune, harvest and taste here the way they always have.
We drive up slowly and stop at a family quinta, or estate, that is expecting us. You walk between the rows, then taste with the valley below you. Wear shoes with good grip for the vineyards. Lunch, looking out over the vines, is often the part people remember most.

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