People take a guide tour at the vineyard of Gerovasiliou winery during the event "Open Cellar Doors", Thessaloniki, Greece, on May 26, 2018. The annual event "Open Cellar Doors", which is organized by Greek Wine Producers Associations, took place in several wineries in north Greece, giving wine lovers and visitors opportunity to get acquainted with Greek wine and the winemakers.(Xinhua/Dimitris Tosidis)