The story
As you stand here at the edge of the Vltava River, let your gaze climb the weathered stone of the Novomlýnská Water Tower. This isn’t just a piece of infrastructure; it is a survivor. For centuries, this neighborhood, known as Nové mlýny or the New Mills, was the pulse of Prague’s water system.
While the city’s famous spires often reached for heaven, this tower had a more grounded, vital purpose: quenching the thirst of the residents of the New Town. Take a moment to look closely at the upper reaches of the northern facade, the side facing the river. High up, embedded firmly in the masonry between the windows, you will see a dark, round shape.
That is not a decorative flourish or a structural anchor. It is a genuine Swedish cannonball, a heavy iron relic of the year 1648. It has been lodged there for over three hundred and seventy years, a permanent reminder of the final, bloody act of the Thirty Years' War.
In the autumn of 1648, Prague was a city under siege. The Swedish army had already seized the Castle and the Lesser Town on the opposite bank of the river. They turned their heavy artillery toward the Old and New Towns, raining fire across the water.
The defense of the city fell not just to professional soldiers, but to university students and common citizens who fought desperately at the barricades of the Charles Bridge and along these very riverbanks. The original tower on this site was made of wood and was devastated by the Swedish bombardment. When the citizens rebuilt this stone version in 1658, just a decade after the peace treaties were finally signed, they chose not to hide the evidence of the struggle.
They took one of the many cannonballs that had crashed into their streets and set it into the new stone wall as they built it upward. It was a deliberate act of defiance and a tribute to the resilience of a population that refused to let their city fall. Imagine the roar of the cannons echoing off the surrounding hills and the splash of iron projectiles hitting the Vltava just yards from where you are standing.
Today, the area is peaceful, filled with the gentle hum of the city and the shadow of the nearby St. Clement’s Church. But that iron ball remains—a silent, frozen moment of violence in an otherwise tranquil skyline.
As you continue your journey through Prague, remember that this is a city that wears its history on its sleeve, or in this case, deep within its walls. The Novomlýnská tower reminds us that we rebuild after the storm, often carrying the weight of the past with us as we reach for the future.