Tourists visit the Old Town in Warsaw, Poland, on April 28, 2026. (Photo by Jaap Arriens/Xinhua)

People buy flowers in the Old Town in Warsaw, Poland, on April 28, 2026. (Photo by Jaap Arriens/Xinhua)

Tourists visit the Old Town in Warsaw, Poland, on April 28, 2026. (Photo by Jaap Arriens/Xinhua)

This photo taken on April 28, 2026 shows buildings near the Old Town in Warsaw, Poland. (Photo by Jaap Arriens/Xinhua)

This photo taken on April 28, 2026 shows the barbican of the Old Town in Warsaw, Poland. (Photo by Jaap Arriens/Xinhua)

Sparrows are seen in water in the Old Town in Warsaw, Poland, on April 28, 2026. (Photo by Jaap Arriens/Xinhua)