Sightseeing boats travel on the Fontanka River in St. Petersburg, Russia, April 19, 2026. St. Petersburg features a dense network of waterways and over 300 bridges crisscrossing the city. (Photo by Guo Feizhou/Xinhua)

A sightseeing boat travels on the Fontanka River in St. Petersburg, Russia, April 19, 2026. St. Petersburg features a dense network of waterways and over 300 bridges crisscrossing the city. (Photo by Guo Feizhou/Xinhua)

This photo taken on April 19, 2026 shows the scenery of the Moika River in St. Petersburg, Russia. St. Petersburg features a dense network of waterways and over 300 bridges crisscrossing the city. (Photo by Guo Feizhou/Xinhua)

A sightseeing boat travels on the Fontanka River in St. Petersburg, Russia, April 19, 2026. St. Petersburg features a dense network of waterways and over 300 bridges crisscrossing the city. (Photo by Guo Feizhou/Xinhua)

A sightseeing boat travels on the Fontanka River in St. Petersburg, Russia, April 19, 2026. St. Petersburg features a dense network of waterways and over 300 bridges crisscrossing the city. (Photo by Guo Feizhou/Xinhua)

This photo taken on April 19, 2026 shows a view of the New Holland Island in St. Petersburg, Russia. St. Petersburg features a dense network of waterways and over 300 bridges crisscrossing the city. (Photo by Guo Feizhou/Xinhua)