Blaues Schloss -

: A medieval hilltop fortress that hosted the famous Marburg Colloquy in 1529 between Martin Luther and Ulrich Zwingli.

: It now houses the Museum of Cultural History, featuring Gothic halls, a chapel with medieval frescoes, and artifacts of Hessian life. Blaues Schloss

While not formally named "Blaues Schloss," the (Landgrafenschloss) is the most significant castle in the city where the Blaues Schloss publishing house is located. : A medieval hilltop fortress that hosted the