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By the 19th century, the popularity increased with people from the provinces of Minho, Trás-os-Montes and Alto Douro that arrived by medical advice to cure several health problems, by breathing the air and diving in the rich iodine seawaters of Póvoa, in a popular movement that occurred in the European Atlantic coast since the 18th century, from Biarritz to Póvoa de Varzim.
There are also scenic natural parks and mountain ranges, such as the Peneda-Gerês National Park, the Montesinho Natural Park, the Alvão Natural Park and four World Heritage Sites: the Alto Douro Wine Region, the Prehistoric Rock-Art Sites in the Côa Valley, the Porto historical Center and the Guimarães historical Center.