Photo taken on Oct. 20, 2019 shows the autumn scenery in Oslo, Norway. (Xinhua/Zhang Cheng)

Photo taken on Oct. 21, 2019 shows the autumn scenery in the village of Flam, which is located in the center of Sogn Fjord in Norway. (Xinhua/Zhang Cheng)

Photo taken on Oct. 21, 2019 shows the autumn scenery in the village of Flam, which is located in the center of Sogn Fjord in Norway. (Xinhua/Zhang Cheng)

Photo taken on Oct. 23, 2019 shows the autumn scenery in the city of Bergen, Norway. (Xinhua/Zhang Cheng)

Photo taken on Oct. 22, 2019 shows the autumn scenery in the township of Voss, Hordaland County, Norway. (Xinhua/Zhang Cheng)

Photo taken on Oct. 21, 2019 shows the autumn scenery in the village of Flam, which is located in the center of Sogn Fjord in Norway. (Xinhua/Zhang Cheng)

Photo taken on Oct. 22, 2019 shows the autumn scenery in the township of Voss, Hordaland county, Norway. (Xinhua/Zhang Cheng)

Photo taken on Oct. 20, 2019 shows the autumn scenery in Oslo, Norway. (Xinhua/Zhang Cheng)

A tourist takes pictures of the autumn scenery at Frogner Park in Oslo, Norway, Oct. 20, 2019. (Xinhua/Zhang Cheng)

People view autumn scenery at Frogner Park in Oslo, Norway, Oct. 20, 2019. (Xinhua/Zhang Cheng)

Photo taken on Oct. 21, 2019 shows the autumn scenery in the village of Flam, which is located in the center of Sogn Fjord in Norway. (Xinhua/Zhang Cheng)

A passenger walks on the street in the city of Bergen, Norway, Oct. 23, 2019. (Xinhua/Zhang Cheng)

Photo taken on Oct. 19, 2019 shows the autumn scenery in Oslo, Norway. (Xinhua/Zhang Cheng)

A passenger walks on the street in the city of Bergen, Norway, Oct. 24, 2019. (Xinhua/Zhang Cheng)