Burgau Castle was originally surrounded by a water trench which gave the name to the village Burg in der Au ('Castle in the Meadow'). The fortification was of great strategic importance against ongoing Turkish and Hungarian invasions from the East across the nearby Lafnitz river. The castle was first mentioned in 1367 as a property of the lords of Puchheim. Then the municipality and the castle were given as a feoff to the house of Neitberg before being handed over to Weikhard von Polheim. Thanks to newly built fortifications commanded by Erhard von Polheim, the invading Turks could be defied in the years 1529 and 1532. In the end, the indebted property of Burgau was given to Mathias von Trauttmannsdorff, who oppressed the local population with high socage fees. In 1704, Eastern Styria was heavily devastated by attacking Kuruz, Hungarians rebelling against the Habsburgs. The mayor saved the village by offering weapons and money to the invaders.
Today the renovated Burgau Castle houses the mayor's office, apartments and a café. The festive hall and the arcaded courtyard are used for indoor and outdoor cultural events and annual exhibitions for Christmas and Easter.
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.