In the historic center of Kaliningrad, on the contrary Kronprinz defensive barracks, it is the largest bastion Grolmanskogo top front-fired redyuitom. The defensive structure was built in 1851, designed by the military engineer Ernst Ludwig von Aster and named in honor of the Prussian army reformer, a member of the Napoleonic Wars - General Karl Wilhelm von Grolman.

Bastion "Grolman" is a large fortification holding section from Frunze Street to the street Alexander Nevsky, and consists of two-storey brick redyuita horseshoe-shaped, powerful pentagonal fortification with a yard space, angle directed toward the defensive wall, guardhouse, two polukaponirym, earthen shaft, the two gorge casemates part beachhead and exit gates. Fortifications "Grolman" is a central part of the complex of fortifications rotary shaft - the shaft of Lithuania (later gave the name of the street), consisting of eight bastions, two and three polubastionov wooden gate with earth bunding. Bastion "Grolman" was connected to the barracks Kronprinz underground passage. In the early twentieth century, Reduit bastion gained the third floor.

During the assault of Koenigsberg bastion he remained one of the last pockets of resistance and suffered considerable destruction. In the postwar period it has been adapted for vegetable storage, in the early nineties most were conserved. In March 2007, the bastion has received the status of cultural heritage (regional level). Today Bastion "Grolman" remained almost intact, exterior part of the building is occupied by commercial organizations, external parties are available for viewing. Defensive structures is an example of the construction of the fortress the mid-nineteenth century.

In the immediate vicinity of the bastion "Grolman" located barracks Crown Prince and King's Gate, within walking distance of the bastion "Overtayh" Rossgartenskie gate tower Dona, Sackheim gate and bastion Reduit "Kupfertayh."