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Port wine vines need to grow in schist rich soil and require a specific micro-climate. It is produced through a unique vinification method. The red varietals are the most common. The wine is produced in the beautiful landscape of the Douro Valley in Alto Douro region, a region that is classified as World Heritage by UNESCO. The wine is exported from the city of Porto, thus acquiring the name "Porto" (or "Port" in English-speaking countries). There are several varieties of Port wine: some of the most popular are the Tawny, White, Ruby, and Late Bottled Vintage (L.B.V.). Wine cellars where port wine is stored to mature can be visited all year around in order to get information about the history of Port Wine and the Douro region.