The first documented record of Hohenurach Castle dates from 1235, but it was probably built in the 11th century by the Counts of Urach. Count Ludwig I of Württemberg updated the castle in 1427, building a new castle on the existing foundations. Following heavy damage in 1547 during the Schmalkaldic War, Duke Christoph of Württemberg had the castle rebuilt in 1551. From the 16th century onwards, the castle complex also served as a state jail, whose inmates included the Tübingen Professor Nicodemus Frischlin (1547-1590).
As a military facility Hohenurach Fortress also posed a constant threat to the citizens of the nearby town. It wasn't until 1765, however, that Duke Carl Eugen of Württemberg decided to move his soldiers to the town and had Hohenurach Fortress torn down. All that remains of the castle site is a towering ruin – one of the biggest, mightiest and most important ruins in southern Germany.
The castle ruins are free to explore, but can only be accessed on foot.
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.