The massive stonewall, stretching straightforward between the two coasts of Öland, was built due the orders of Duke Karl Gustav, later King Karl X Gustav in 1653. The intention was to keep the deer in the royal hunting grounds from escaping them, although many speculate it served the double purpose of keeping the peasantry away from his sport. It was built with local materials and local labour in lieu of taxes. The surrealistic wall in open landscape is still in good condition.
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.