The Round Tower stands on Market Square in Vyborg, a sturdy relic of a time when fortifications had to evolve faster than the weapons that threatened them. Built between 1547 and 1550 under the orders of Gustav Vasa, it was designed by the military engineer Hans Bergen to address a pressing problem: the old city walls, dating back to the 1470s, were no longer enough to withstand modern artillery. The solution was to push the tower forward, seventeen meters beyond the line of the walls, allowing defenders to fire along their length in a sweeping, enfilade barrage. Its slightly oval shape—about twenty-one meters in diameter—was no accident, but a deliberate choice to deflect cannonballs and distribute the force of impacts. The walls themselves are a study in defensive pragmatism: nearly four meters thick on the eastern side, where the threat was greatest, and slightly thinner on the west.
At the time, the tower was part of a larger plan to fortify the city’s vulnerable eastern flank. A second, identical structure was meant to be built nearby, guarding the Cattle Gate, but only one was completed. The existing tower was connected to the old walls by a barbican—a fortified passageway of thick stone walls with an inner roadway, designed to funnel attackers into a killing zone. This defensive complex was just the beginning. By 1564, under Erik XIV, Vyborg’s fortifications expanded into a full bastion system, its angular protrusions earning the fortress the nickname the Horned One. The Round Tower, now integrated into this new network, became one of the city’s key strongpoints.
For all its military purpose, the tower also played a more mundane role in daily life. The neighboring structure, which once protected the Cattle Gate, was unofficially known as the Sheep Prison. Stray livestock would be locked inside until their owners paid a fine to reclaim them, a small but telling detail of how the city’s defenses doubled as tools of local governance. The tower’s strategic importance, however, was undeniable. In 1609, it was the setting for the signing of the Treaty of Vyborg, a pact between representatives of Sweden’s Charles IX and Russia’s Vasily Shuisky. In exchange for Swedish military aid against the Poles, Russia agreed to cede the fortress of Korela—a deal that underscored Vyborg’s position as a contested prize between two expanding powers.
When Russian forces finally took the city in 1710, the Round Tower, now renamed the Petersburg Tower, found itself far behind the front lines. Its military role faded, and it was repurposed as an arsenal and customs post, where travelers paid duties on their goods. The 19th century brought sweeping changes to Vyborg’s urban landscape. In 1861, the old walls and bastions were demolished to make way for a new city plan, leaving the tower as an isolated survivor on the edge of Market Square. For a time, it served as a warehouse, then a storage site for explosives, and later a prison—each new function erasing a little more of its original purpose.
Today, the Round Tower is best known for the restaurant that has occupied its interior since 1976. It’s one of the few ways to step inside without joining a guided tour, though the building’s true character is still most visible from the outside. From Market Square, it stands as a quiet counterpoint to the bustle of the nearby market stalls and the calm expanse of the bay beyond. The tower’s thick walls and rounded silhouette are a reminder of a time when Vyborg was a fortress first and a city second, its streets shaped by the demands of war rather than the rhythms of commerce. Even now, centuries after its guns fell silent, it retains a sense of solidity, as if the weight of history has settled into its stones.
