Tower of Slaves is a small, high rectangular building with thick walls and openings in the upper part. It is built of rough stone, brick, lime and clay mortar in the Stelmužė park, near Padvarinės (Stelmužė) lake.

In XVII-XIX centuries there was a manor house, originally owned by Germans Fölkersahms, and later by the Tsar's courtiers Valujevs, who were known for their cruelty. In the built tower they used to punish and imprison serfs for the night, and at the day the serfs were driven out to work again. Tower of slaves served as a prison. The thickness of tower walls is 0.75 m. The building is renovated and added to the list of architectural monuments of the seventeenth century.