Mir Castle is a brick fortress of five towers in the Grodno region of western Belarus, built in the 1520s and remodelled within one lifetime into a Renaissance palace, so that firing loops and limestone balconies stand on the same walls, and it is entered where the garrison did, over a plank ramp and under the lattice gate, with its towers mirrored upside down in the pond below the walls on a still morning. The castle was built by the Ilyinich family as a Gothic fortress of red brick with a tower at each corner and one over the gate, and passed to the Radziwiłłs, who turned it into a residence within decades, adding the palace wings and the galleries; the green banks ringing it are earthworks of the seventeenth century, thrown up once cannon had made the brick too weak to hold, and walked as a path around the walls, while a tight spiral of worn stone steps lifts the visitor out of the palace and onto the top of the curtain wall. A carved stone ram's head is set into the outer wall. The halls run from a vaulted cellar kitchen to the Portrait Hall, rebuilt as it looked in the 1740s, where the Radziwiłłs watch from the walls.
The last owners were the Sviatopolk-Mirskis, who bought it in 1895, laid out the landscape park and built a chapel-mausoleum in it in the early 1900s with a gold mosaic of Christ above their coat of arms; the pond below the walls is said to be cursed, since it swallowed an orchard when it was dug. In the war the Germans made the castle a ghetto for the Jews of the town, and a tip-off from inside the police station, from a young Jew working there as an interpreter on forged papers, let some 200 escape into the forest before the killing. Mir is a fortress that became a palace before it was finished, and the walls carry both.