Fort Claudia (1645) - The strategic importance of the mountain crest across from Ehrenberg was long known. It played an important role in the reconquest of Ehrenberg in 1546.
A fortification was never built due to lack of funds. So it was also in 1632, when the Swedes marched to the gates of Ehrenberg. Only years later, from 1639 to 1645, under the Tyrolean regent Archduchess Claudia was Fort Claudia built, and named after this princess.
In 1703 Fort Claudia was taken by the Bavarians, who began the occupation of Ehrenberg from here. In 1782 the fortress was closed down. Even in the 19th century, the old fortress was inhabited, yet was left to decay after it was abandoned.