Porto Cálem is one of the most famous wine cellars of Oporto, it has produced wines of extraordinary quality since 1859, the visit is a pleasant and instructive experience. The winery is in Vila Nova de Gaia, just across the bridge, and offers tours that begin with a didactic and interesting museum. There data on the Region Douro Wine Region, production of Vinho do Porto and the long history of the winery. The tour continues through the cellars, where special conditions, aging delicious house wines. Daily visits May-October: 10-19 hours, November-April: 10-18 hours.