Europe's oldest vineyards can be found in the Douro Valley. Winegrowers have been making wine here for 2,000 years. In 1756, it was even the first region in the world to demarcate vineyards and classify them. The Douro Valley has very hot, dry summers and cold winters. Fairly inaccessible by road for hundreds of years, the Douro was the only way to transport wine from the valley's vineyards for export around the world. Since 1991, the Upper Douro Valley has been a UNESCO World Heritage Site.
