Colditz Castle is a Renaissance castle in the town of Colditz near Leipzig, Dresden and Chemnitz in the state of Saxony in Germany. The castle is between the towns of Hartha and Grimma on a hill spur over the river Zwickauer Mulde, a tributary of the River Elbe. It had the first wildlife park in Germany when, during 1523, the castle park was converted into one of the largest menageries in Europe.