The unfinished monument of little castle of Ptačí Hrádek is located to the north not far of the State Castle of Český Krumlov. It was bulit in commemoration of the victory of the United army of Russia, Austria and Prussia over Napoleon Bonaparte in the battle of Leipzig in 1813. These United armies were commanded by the Brother of duke of Český Krumlov Karel I. Filip of Schwarzenberg. The design of this monument was made by the builder Jan Sallaba who also designed the observation tower on the top of the Kleť hill. The whole construction was stopped for lack of money and it was only roofed over.