Paris flooded, 1910
Nothing can compete with the last winter, which was one of the coldest ones the world had seen yet, but the winter of 1910 in Paris is a close runner-up, when after months of high rainfall, the Seine river was flooded.
The capital of France was flooded through tunnels, sewers and drains. The city wasn’t unfamiliar with winter floods, but this was an astonishing event.