To visualize their power towards Tyrol/Austria, which held the closely sited castle of Falkenstein, Peter of Hohenegg decided to build Eisenberg in a most impressive manner: he placed it on top of a high mountain and surrounded the main castle with an exceedingly high curtain wall which gave the impression of a huge tower.

The two residential houses together with the kitchen and chapel leaned against the inside of the curtain wall.

Nevertheless the castle was rebuilt ten years later in a sumptuous way by Werner Volker of Freyberg after receiving high compensation payments from the peasants.

He improved the living luxury immensely by erecting a new stair tower and adding a bakery, a bath and several mured toilets to the curtain wall.

The end of the castle came on the 15 September 1646, shortly before the end of the Thirty Years' War, when the Austrians burnt their own castles of Eisenberg, Freyberg and Falkenstein in a policy of scorched earth.