Laiuse castle, or castle Lais (it. Schloss Lais), was founded by the Livonian Order in the 14th century. Construction lasted until the mid-15th century. This castle was built as a subsidiary and has been adapted for the use of firearms.

First built the central part of the size of 21h11, 6 m, and a circumferential wall in the form of a trapezoid. Initially the height of the wall is 9 meters and the thickness - a little more than 1 meter. Later, in the 15th century. The height and thickness of the walls of the castle have been increased. The maximum height of the preserved wall is 13, 8 meters, and the height of the partially destroyed the tower - 22 meters. The diameter at the base of the bath reaches 14 m, the thickness of the walls - 4 meters.

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