Allentsteig Castle, located on a rock to the north of Allentsteig and bordered by a former moat to the east, was founded by the Kuenringers around 1000. It remained in the possession of the Lords of Kamegg-Kaya until about 1390.
Around 1500, the Hager family received the estate and transformed the medieval castle into a Renaissance palace between 1544 and 1570. Sigmund Hager, a prominent Protestant, visited Luther in Wittenberg. Paris von Sonderndorf acquired Allentsteig in 1599 and, due to his opposition to the Emperor, the town was plundered and occupied during the Thirty Years' War. In 1629, Hans Friedrich von Sonderndorf lost his estate, which was then acquired by the Rappach family. By marriage, it passed to Count Ernst August von Falkenhayn.
Fires in 1682 and 1752 caused significant damage. In 1804, Baron Leopold von Hahn bought the estate, and it later passed to the Pereira-Arnstein family and the Princes of Liechtenstein. Baroness Maria von Preuschen inherited it in 1918. When the German Reich established the Allentsteig military training area in 1938, the castle became the command center, a role it retained under Austrian control after the Russian occupation from 1945 to 1955.
The outer walls of the five-sided Renaissance structure largely originate from the medieval castle. The oldest parts include the massive keep from the second half of the 12th century with a Romanesque portal and the adjacent eastern quoin wall. The turreted top floor with a tent roof was added in 1904. The castle is accessed from the east through a two-story gate hall from the 16th century, featuring a wide bay window over a Renaissance portal. The inner gate wall, dating to around 1300, is pierced by a Gothic pointed arch from the early 14th century. The windows with profiled stone frames on the outer front date to the late 16th/early 17th century. The three-story rectangular arcade courtyard, marked with 1576, features flat arches on Tuscan columns on three sides. The interior was mostly remodeled in the late 19th century, including historicist tile stoves.
Currently (as of 2016), the castle houses the command of the Allentsteig military training area and the 4th Reconnaissance and Artillery Battalion.
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.