Upper: An old photo of the Haiyin Bridge and its cable-stayed structure. It spans the Pearl River in Guangzhou. Lower: Aerial view of the Haiyin Bridge in 2017. [Photo/Xinhua]

Left: An old photo of the Guangzhou Bridge, which connects the south and north sections of Guangzhou Avenue. Right: An aerial view of the Guangzhou Bridge taken on May 5, 2017. [Photo/Xinhua]

Upper: An old photo of the Zhongshayi Overpass. It's located at the intersection of Dongfeng Road and Tianhe Road, Guangzhou. Lower: Aerial view of the Zhongshanyi Overpass in 2017. [Photo/Xinhua]

Upper: An old photo of buildings along the Pearl River. Lower: An Aerial view of buildings along the Pearl River in 2017. [Photo/Xinhua]

Left: An old photo of Guangzhou Avenue. Right: Guangzhou Avenue in March, 2017. [Photo/Xinhua]

Upper: An old photo of the Haizhu Bridge. Built in 1933, it was the first bridge across the Pearl River. Lower: The Haizhu Bridge in 2017. [Photo/Xinhua]

Upper: An old photo of the Tianhe Sports Center. It's a sports complex consisting of a stadium, a gymnasium, a natatorium and other supporting facilities. Lower: An aerial view of the Tianhe Sports Center in 2017. [Photo/Xinhua]

Upper: An old photo of the White Swan Hotel. Built in 1983, it is a 34-floor luxury hotel in Shamian Island, Guangzhou. Lower: The White Swan Hotel in 2017. [Photo/Xinhua]