People chat on the street in Cuenca, Spain, Dec. 11, 2020. As a world heritage site, Cuenca is renowned for its abundant historical buildings. (Xinhua/Meng Dingbo)

Photo taken on Dec. 11, 2020 shows the street view of Cuenca, Spain. As a world heritage site, Cuenca is renowned for its abundant historical buildings. (Xinhua/Meng Dingbo)

Photo taken on Dec. 11, 2020 shows the scenery of Cuenca, Spain. As a world heritage site, Cuenca is renowned for its abundant historical buildings. (Xinhua/Meng Dingbo)

People chat in front of a shop in Cuenca, Spain, Dec. 11, 2020. As a world heritage site, Cuenca is renowned for its abundant historical buildings. (Xinhua/Meng Dingbo)

Photo taken on Dec. 11, 2020 shows the scenery of Cuenca, Spain. As a world heritage site, Cuenca is renowned for its abundant historical buildings. (Xinhua/Meng Dingbo)