Ptuj Castle Terme Ptuj Ptuj Castle is the most famous attraction in Slovenia. Because of its convenient position the hill on which the castle, attracted lords in the medieval period. As early as the ninth century on this place was built the fortress tower have been preserved to our times. It is located in the western part of the castle. In the twelfth century structure captured by Archbishop Konrad of Salzburg. He gave orders to build a huge castle on a hill. In this form it is today.