Engelbourg Castle was built around 1224 by Count Frederick II of Ferette to guard the entrance to Thur Valley. It was severely damaged a few centuries later during the Thirty Years' War and destroyed on the orders of Louis XIV in 1673, when its strategic role was no longer valid.
The main tower broke into several sections.The main part fell on its side looking towards the town of Thann, and this is what we call the Witch's Eye, as it seems to stare at the roofs in the village and off into the horizon.
Today, it can be reached by a steep stairway in about 20 minutes or by a walk through the vineyards in about 40 minutes. It is worth making the effort as you will have a magnificent panorama over the valley, the collegiate church and the town of Thann.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.