Barrels are seen at the Frankfurt Apple Wine Festival in Frankfurt, Germany, on Aug. 15, 2018. The Frankfurt Apple Wine Festival is held here from Aug. 10 to Aug. 19. Frankfurt's apple wine culture has been playing an important role in the city's social life for hundreds of years. Every year, locals and visitors come together to celebrate Frankfurt's most popular beverage with the Apple Wine Festival. (Xinhua/Luo Huanhuan)